The Hawk Who Mistook Her Mate for a Meal

Seriously, it could happen to anyone.

Well, any working mom operating on instinct and snap-judgements who needs to snag some groceries before she flies back home to those perpetually ravenous kiddos.

Okay… maybe it couldn’t happen to anyone. But every now and then, once in a very blue moon, some harried female Cooper’s hawk (Accipiter cooperii) will be scanning earth and sky for something to serve for supper, probably thinking about the million other things on her to-do list, and she’ll innocently, accidentally, absentmindedly, kinda-sorta… confuse her spouse for take-out.

At which point she becomes a single working mother.

Now, before you get all mommy-shamey (“I would never feed my children their dad for dinner, but maybe that’s just me…), at least hear her side of the story.

First of all, you need to understand that most predators have a niche, a specific go-to prey that’s based, at least in part, on their particular hunting skill-set. Coopers are no exception; as one of the world’s most adept and daring fliers, they’re capable of barnstorming through a tangle of tree leaves, twigs, and branches as they chase down some chow. Naturally, their aerial talents give Coopers an edge when it comes to the pursuit of other winged creatures. Sure, if the opportunity presents itself they’re not going to turn up their beaks at a frog, a chipmunk, or a bat but the Coopers prey of choice is birds.

When a Cooper’s prey drive kicks in, male and female alike, the only thing that matters in that moment is hitting the target. They don’t even give much consideration to potential risk to life and limb, it seems. According to the Cornell University Lab of Ornithology, a study of this species found nearly a quarter of the 300 skeletons examined had healed chest fractures, especially of the furcula (aka wishbone, analogous to the collarbones in humans).

Of course, just because you’re willing to endure some broken bones to get the job done doesn’t mean you wouldn’t welcome easier access to some eats. Coopers are savvy enough to recognize that a backyard bird feeder is the hawk equivalent of a drive-through restaurant. If they’re lucky enough to have one or more of these bistros in their neighborhood, they’ll cruise on over and hang out in some nearby foliage until feathered patrons stop by for a snack, then grab-and-go. The humans who stock these seedy establishments can get pretty judgemental about what they view as harassment, or even exploitation, of their preferred clientele but that’s the biological carbon cycle for you. Everybody’s gotta eat.

Which brings us back to the hawk who mistook her mate for a meal.

Like many raptors, female Coopers are quite a bit larger than their male counterparts—taller, heavier, longer wing-span, you name it.  But it’s not her size that puts him at risk; it’s his.

See, Coopers tend to focus their hunting efforts on pigeons, mourning doves, flickers, cowbirds, kestrels… in other words, avian species ranging in size between an American robin and an American crow. Ironically, at 14½ to 15¼ inches from beak to tail-tip, the male Cooper’s hawk fits neatly into his very own prey niche. Add to the issue of similar stature the fact that both predator and prey share, in many cases, a color palette of whites, grays, and rusts, and it’s obvious to the most casual observer how the daily chore of hustling up some grub for the family can easily turn into an unfortunate case of mistaken identity.

I guess blue moons and beleaguered female hawks aren’t as uncommon as one might think because male Coopers have a stereotypic strategy for dealing with a distracted but fiercely efficient domestic partner.  First, as he approaches the home-front, he flies in large, slow arcs and hollers out the hawk version of “Honey, I’m home!!”  Then he listens carefully for the female’s “all-clear” response call, signaling that she sees and recognizes him. When he arrives at the nest he’ll have a thoughtful gift in his bill… a little something for her and the chicks to nosh on, or a few home maintenance supplies. Cuz, you know, it never hurts to tip the scales in your favor.

Happy hawk wife, longer hawk husband life.


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© 2019 Next-Door Nature. No reprints without written permission from the author (I’d love for you to share my work, just ask first). Thanks to these photographers for making their work available through a Creative Commons license (from top to bottom): Hal Trachtenberg, Jenny, Chuck Roberts, Jeff Bryant, and Hal Trachtenberg.

The Jet Set

Everyone has their own personal markers of summer—the flash of a firefly, the pulsing hum of cicadas, the aroma of freshly cut grass… I’m sure you have a favorite.  To my mind, nothing says summer quite as definitively as the sight of chimney swifts (Chaetura pelagic) foraging overhead.

These small, sleek birds have belonged to the feathered Jet Set since way back. They’re trendsetters, not fad followers. For example, fashionistas trade angora sweaters and down anoraks for bright floral sundresses and tropical guayaberas as the calendar flips past March, April, and May, but swifts stick to a classic all-season, all-purpose ensemble in understated hipster tones of sooty charcoal accented with an ash-gray ascot.  Très chic! Moreover, chimney swifts really don’t need a cold weather wardrobe; when the temperature changes swifts change their address. They winter in Peru, Brazil, Ecuador, or Chile, not St. Barts or Dubai, and they always summer east of the Rockies. They simply love, love, LOVE the U.S.A and Canada, dahling.

Every chimney swift would be a platinum-status frequent flyer if they weren’t all pilots themselves.  Their cigar-shaped fuselage and narrow, curved wings are built for speed and acrobatic maneuverability, so you won’t find them shuffling through airport security headed for the first-class lounge. Commercial flights are so… pedestrian. Anyway, these birds are rarely ever seen standing still.  Their Latin family name—Apodidae—means “footless,” and while that’s not strictly true their legs and feet are not their strongest feature.  Swifts don’t perch; when forced to land they cling to vertical surfaces, including the walls of those eponymous chimneys.

Which brings us to another characteristic that sets swifts apart from the globetrotting glitterati. Long before Airbnb matched adventurers and accommodations, chimney swifts were bypassing 5 star hotels in favor of host families. It all started when Europeans arrived in the New World and began building houses and fireplaces. The local swifts, who had been housekeeping in hollow trees for more generations than anyone could count, saw an opportunity to make a killing in real estate. They seized the day and the rest is history. Now swifts are North America’s summer house guests, albeit usually uninvited and sometimes unwelcome.

It’s not because they’re inconsiderate. Swifts mostly mind their P’s and Q’s. They don’t monopolize the bathroom taking long, hot showers—a quick splash in a puddle or pool, followed by a thorough mid-air shake, does the trick.  They never raid the family fridge—thousands of in-flight protein-rich insects snacks each day provide nourishment. They don’t expect a chambermaid and fresh linens—using found objects, such as small twigs, and glue-like saliva they fashion temporary fire-resistant DIY berths on the chimney wall to cradle their offspring.

Actually, it’s their kids that cause most conflicts with the conscripted landlords.  Chimney swifts rear 1-2 broods of 3-5 young while visiting the Northern Hemisphere.  The chicks, who snuggle up quietly together while napping, turn into the very definition of sibling rivalry each time a parent arrives at the nest to deliver a meal. The hungry mob push and shove for position, stretching wobbly necks to the heavens. They open their mouths wide and scream their heads off so Mom or Dad will notice and reward them with a juicy morsel. Those high-pitched squeals for attention amplify as they bounce down the open chimney shaft, past the damper, and out into the room below. Multiply that acoustic event by hundreds of feedings per day and the human residents can begin to feel as though they’re being strafed with sound.

There’s a simple solution to live and let live.  A thick slab of Styrofoam™ (aka expanded polystyrene) from the local craft store, cut to fit snugly inside the hearth opening, will reduce the chatter to a tolerable decibel level.

Meanwhile, it can help to remember that their parents are scouring the skies above your humble abode for mosquitoes, making summer evenings outdoors much more pleasant. Plus, it only takes 2-3 weeks for the youngsters to progress from hatchling to flying away, which is pretty impressive you have to admit.

Still, if you’d rather not play innkeeper to international travelers you can turn off the Vacancy sign by installing a chimney cap.  This relatively inexpensive device will not only exclude all manner of wild things from moving into (or falling down) the flue, the cap will also stop downdrafts, prevent sparks and embers from landing on the roof, and block rain, leaves, and branches.

Keep in mind, though, that once a chimney swift family has moved in you can’t legally evict them.  The Migratory Bird Treaty Act gives swifts and most other wild birds a kind of diplomatic immunity so you’ll have to wait until they jet back to South America to pull up the Welcome mat.


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© 2016 Next-Door Nature. No reprints without written permission from the author (I’d love for you to share my work–just ask first). Thanks to these photographers for making their work available through a Creative Commons license (from top to bottom): Jim McCulloch, Chester A. Reed (public domain), Greg Schechter, and Jim McCulloch.

Helicopter Parent

As the most literal of helicopter parents, a ruby-throated hummingbird mom (RTH, Archilochus colubris) takes hovering to a whole new competitive level.

In the case of this feathered sprite (2.8 – 3.5″ long, including bill, and just over 1/10 of an ounce), though, the word “hover” has more to do with the ability to fly than with over-protective child rearing. Which is not to suggest that an RTH mom is neglectful. Far from it… she’s just a bit Type A.

Both male and female RTHs winter in Central America or along the southern tip of Florida, but from the moment a gal returns to her summer stomping grounds in the eastern half of the US or southern Canada, she’s all go-go-go… because her biological clock is ticking like a stopwatch.

Barely hesitating to catch her breath, the first order of business is to find a baby daddy. She’s not looking for ever-after; Mr. Right-for-Now will do as long as he’s strong and handsome. Since the males of her clan aren’t the slightest bit interested in becoming a Mr. Mom this arrangement suits everyone just fine. With barely a look backward by either party following their four-second assignation, he jets off to find another hookup, and she speeds away to shop for flower-down to line the bassinet.

It takes about six days for this mom-to-be to fashion a nest barely wide enough to hold a bottle cap, and tether it to a foundation with strands of spider silk. RTH nests are most often built on a tree branch but unusual alternatives, including loops of chain or extension cord, have proven acceptable in a pinch. Darting back and forth, the female will weave bud scales, lichen, hair or fur, and other creatively repurposed found objects into a cup-shaped cradle. Next, she’ll adorn the nest with lichen and moss, finally lining the interior with a soft, insulating layer.

Once the nursery has been prepared and decorated, 1-3 eggs the size of your pinkie fingernail will appear, and then… a pregnant pause.

Think about it. The longest stretch this single mother ever sits down, during her entire life, is to incubate a clutch of future hummers. Imagine, if you will, the kind of patience, willpower, and elevated estrogen levels it takes for a creature who has lived on the wing, perpetually flitting hither and yon since leaving her own natal nest, to STOP…  settle in… and then just…

……………………sit…

…………………………..for 12-14…..

……………………………………………..long…..

………………………………………………………….idle…..

……………………………………………………………………..days.

During this time, the newly stationary creature will leave her nest only for brief breaks to stretch or grab a bite to eat. She’ll anchor there, day and night, rain or shine. No baby shower, no friends stopping by to say hello; they’re all brooding their own nest eggs. No television, even though this would be a great time to binge watch David Attenborough’s The Life of Birds. No smartphone at the ready to check email, take selfies, and whine to everyone on Facebook that she is bored beyond reason.

Heck, when I manage to stop and meditate for ten minutes two days in a row I feel like a Zen Master.

Once the chicks hatch it’s back to her normal hyperactive life… and then some. RTH nestlings are naked and wobbly-headed, with an appetite that dwarfs their bitty bodies. For the next few weeks, Mom will need to make 1-3 grocery runs per hour,  from dawn to dusk, regurgitating the food she’s foraged and hauled home in her belly into the beseeching beak of each precious child.

Once the babes fledge at 18-22 days old they’ll disperse among the branches… not too far away from the nest or each other initially, but spaced out enough to make dinner deliveries much less efficient for their harried mother. As the kids grow stronger and bolder, they’ll spread out further, testing their own wings… and Mom’s ability to be everywhere all at once.

Oh, and somewhere in that frantic schedule, this solo parent also needs to down enough calories to keep her own metabolism running on all cylinders.

Luckily, she flies like a super-charged, hyper fuel-efficient, über-nimble helicopter. Hummingbirds have been known to reach speeds of nearly 35 mph (55 kph), which is certainly impressive. Not record-breaking among the avian set, though. The difference is that most of the planet’s fastest feathered fliers reach their top speeds in a dive, asking gravity to add a significant boost to their velocity. Acrobatic RTHs can fly straight and fast, too, but it’s their ability to achieve what those avian missiles can’t—a true hover—that sets them apart.

This isn’t using a thermal to save energy, like vultures, ravens, petrels, and other long-winged birds do. That’s soaring. Hummingbirds move their wings in a figure-eight pattern at over 50 beats per second, allowing them to stop on a dime or adjust their position up, down, forward, or backward. That frenetic rhythm is also creates the humming noise that’s the source of their common name.

It also helps that the lady’s jet fuel of choice is syrup. Flower nectar, to be more precise, accounts for approximately 90% of an adult hummingbird’s daily caloric intake. RTHs and other hummers have a large surface-area:body-mass ratio, which means they lose a lot of heat in the normal course of living. Plus, their metabolism is so high they have to enter a torpor once a day, between sunset and sunrise, just to make it through the night without having to recharge.

Unlike the sugar-water mixtures backyard bird enthusiasts cook up to fill hanging feeders, blossom juice consists of more than just sucrose (from which plain white table sugar is derived). Flowers also produce fructose and glucose, as well as amino acids, antioxidants, calcium and other trace minerals, lipids, phosphates, and some protein. Other sources of protein include insects that have found their way inside the flower’s throat, where they are slurped up along with the nectar. Hummingbirds will also glean aphids from plants, pluck spiders from their webs, and nab flying insects mid-air. During breeding season, female RTHs spend a lot of time catching insects because nestlings need a high protein diet to grow and develop properly. Once they mature they’ll gradually switch to the high-carb diet of an adult.

As befits a fast-paced life, in barely the blink of an eye (or the wing-beat of a hummingbird) summer is over. Male RTHs often head south first, in early August. Females tend to delay departure until late August or sometime in September. After months of feeding others—our feathered Supermom may have raised as many as three broods in a single season—the time has come to focus on self-care, and on building enough fat reserves to power through an 18-22 hour non-stop flight across the Gulf of Mexico.

The last of her children have left the nest and are, hopefully, ready for their first migration. RTHs are solitary migrators so Mom’s helicopter parenting days are over… until next year.

Because a mother’s work is never really done.


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© 2019 Next-Door Nature. no reprints without written permission from the author (I’d love for you to share my work–just ask first). Thanks to these photographers for making their work available through a Creative Commons license (from top to bottom): Dan Pancamo, Steve Rider, TCDavis, BudOhio, ssemone, BudOhio, and Henry T. McLin.

A Moveable Feast

They say necessity is the mother of invention — I guess that’s why spiders found a clever way to order in, long before Kroger and Amazon began to lug customer’s grub. Not even a Costco cart is big enough to satisfy arachnid appetites but spiders rule when it comes to home food delivery. You see, it’s all about the web.

I don’t mean the Internet.

The menu of ingenious spiderweb designs includes: the classic spiral cobweb with its orderly silk scaffolding; messy 3D tangles rigged between available attachment points; carefully woven sheets scattered like picnic blankets across a lawn; funnels and trapdoors; and even a minimalistic single thread and sticky ball baited with pheromone-mimicking chemicals.  Gourmet or generic, webs deliver the vittles.And spiders are a hungry lot. They have to eat approximately 10% of their body weight in prey, each and every day.  Humans, by way of comparison, consume on average only 2–3% of our body weight—2.5 to 4 pounds of food per day. Now, I can already hear you bellyaching, “Not so fast, Kieran! Sure, 10% may sound like a lot at first but spiders don’t weigh very much. This hardly qualifies as extreme eating.” True, even the 12-inch Goliath Bird-Eating Tarantula is significantly smaller than most people. But, believe me, 10% can add up fast.

Based on published spider censuses (yes, I assure you there are people who do this for a living), there’s an average of 131 spiders for every square meter of land on Earth. Here’s a handy visual for metrically-challenged Americans:  Think of a square kitchen table that seats 4 people. Now imagine that table top covered with 131 peckish spiders. Next, see a vista of spider-covered kitchen tables, placed edge to edge like tiles across the entire landmass of our planet.

Remember, 131 is an average so in less hospitable regions the tables will have only a few patrons, while in other parts of the world each table may have up to 1,000 spiders patiently waiting for dinner to arrive. All told, there are approximately 27 million tons of spiders hanging out in the Earth’s forests, grasslands, plateaus, and deserts, our basements, attics, garages, and kitchen tables.

Before you shudder in horror, remember that insects are the spider-snack of choice and, consider for a moment, how buggy the world would be without these arachnid carnivores.

Scientists Martin Nyffeler (University of Basel, Switzerland) and Klaus Birkhofer (Lund University, Sweden) did just that.  They decided it would be fun to compute the global spider grocery bill and possibly add a peer-reviewed paper to their CVs in the process. They reviewed the work other researchers had done on the metabolic needs of spiders, assessed field reports on the number of prey captured and eaten by spiders, threw it all in a statistical blender, and published their calculations in The Science of Nature earlier this year. According to their recipe, spiders catch and eat 400–800 million tons of prey annually.

Let’s put that number in context, shall we?

  • Seabirds (all species) consume 70 million tons of food annually.
  • Whales (all species) consume 280–500 million tons of food annually.
  • Human beings consume approximately 400 million tons of meat and fish each year.

Still not impressed? Every year, the combined weight of insects consumed by spiders is greater than the total biomass of every person on Earth:

                      7.4 billion people x 130 lbs (avg. weight) = 400 million tons

There’s no doubt spiders play a significant role in managing insects, especially in forests and grasslands. The mere intimidating presence of spiders has been shown to limit the feeding behavior of some insects, reducing plant damage.

Spider prey includes insects that are of interest to humans due to their role as pests or disease vectors, but they’re not particularly helpful in managing agricultural pests.  Nyffeler and Birkhofer hypothesize that cultivated lands have less insect diversity and fewer insects overall than undisturbed lands, making them almost as unappealing to spiders as grocery stores.

Grocers must adapt to modern shoppers, though, and spiderweb technology could help capture the home delivery market!


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© 2018 Next-Door Nature. Originally published in Pest Control Technology Magazine (February 2018). Reprints welcomed with written permission from the author. Thanks to the following photographers for making their work available through the Creative Commons license: Tibor Nagy, Christopher, varmfront.se, Katja Schulz, and Marcus.

Spineless Samurai

When the annual cicadas emerge each summer their tymbals vibrate at arboreal drumming circles all over town.  The beats bounce and reverberate against hard city surfaces; during a crescendo, I swear I can feel the buildings and sidewalks pulsing like wings, like a heart. Yet, despite the percussive nature of this invertebrate orchestra, to my ears the cicada’s summer song evokes the kokyū—a traditional Japanese string instrument played with a bow.

This may be due to the fact that I imagine cicadas as miniature ronin, masterless six-legged samurai, stoic and single-minded, clad in intricately constructed armor of lacquered plates and scales. Of course, several beetle species call to mind this 12th-century warrior class, and I’m not the only one to see the resemblance. Rhinoceros beetles (Allomyrina dichotomy), for example, are known in Japan as a kabutomushimushi, the Japanese word for insect, and kabuto, which refers to the helmet worn by samurai (and the inspiration for Darth Vader’s visage).

It don’t know if it’s an example of the sincerest form of flattery or an unconscious imitation, but biomimicry—biological features or processes used as inspiration for beneficial products and practices— is an old technique that’s experiencing resurgence. Humans have long taken cues from the successful strategies of other animals. Indigenous cultures incorporated the characteristics of nonhuman animals into hunting tactics and rituals; composers have used all manner of musical instruments to simulate birdcalls and other nature sounds; superheroes like Spider-Man and Batman are pretty shameless about co-opting the special powers of their totem animals.

Then there’s warcraft. It’s hard to miss the resemblance between certain insects and the body armor worn by human warriors. From my perspective, there’s a natural synergy between invertebrates, who need a rigid external sheath for support and protection due to the absence of an internal skeleton, and Homo sapiens, who need prosthetic exoskeletons to protect our vulnerable bodies from the increasingly deadly technology imagined and fashioned by members of our own species—first flint arrowheads, then copper maces, bronze spears and daggers, iron javelins and swords, cannons and shrapnel, steel rifles and handguns, and eventually weapons that make any kind of armor irrelevant.

Chemical warfare is common in the insect world, and humans have readily adopted the same strategy against both macroscopic and microscopic opponents. In human enterprises, poisons do generally deliver short-term success; however, the initial win is usually followed by long-term health and environmental losses. This is particularly true when chemistry is used against presumed enemies with high reproduction rates… for example, insects and bacteria.

In most biological populations, there will usually be at least a few members strong or lucky enough to survive the application of toxins. Those individuals become the progenitors of the next generation, passing along their protective genetic code and, over time, rendering the chemical weaponry powerless. That’s how natural selection produces organisms well suited to their environment, and that’s why chemical deterrents always have a limited shelf life… against insects and bacteria, anyway. Less than 150 years after the introduction of antibiotics, hospitals and medical personnel are fighting resistant bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and multi-drug-resistant Mycobacterium tuberculosis (MDR-TB), and attempting to do so with a limited alternate arsenal.

As a result, biomimicry is shrinking to nano-scale. Researchers are investigating new ways to protect human bodies from bacterial enemies, and certain insects have proven to be adept at mechanical antibacterial warfare. Think samurai on a microbial level.

In 2013, a team of researchers from Australia and Spain discovered that evolution has armed the clanger cicada (Psaltoda claripennis) with an elegantly simple defense against infection worthy of a kendo master. Clanger wings are covered with nano-pillars—aka tiny spikes.

Initially, it was assumed this pointed texture worked like a bed of nails—a hapless bacterium lands on the wing, stretching and sagging into the crevices between the spikes, and as gravity does its thing the pathogen’s skin tears, rendering it incapable of reproduction. Earlier this year, though, a group of Australian and Nigerian researchers proposed that truth is, once again, stranger than fiction… or at least as inventive as a movie villain.

Bacteria adhere to surfaces and each other by secreting finger-like structures called extracellular polymeric substances (EPS). These natural polymers allow the organisms to form biofilms on plant roots and fruit, fish and boat hulls, teeth and gums, plumbing pipes and medical catheters, even hot alkaline spring waters and glaciers—in other words, nearly any surface we know of except a nano-textured insect wing.

If the bacteria on a clanger cicada wing would stay put, they would likely deform but survive. If they move, though, those pillars subject the EPS to shear forces, ripping the external membrane and causing the bacteria to deflate like a balloon due to fatal leakage of the cell’s contents.

Regardless of how these nano-textured surfaces (NTS) kill, their potential as models for developing chemical-free, non-toxic antibacterial materials is undeniably exciting.  One of the first proposed products to utilize NTS was a coating that could be applied to countertops, doorknobs, railings, bus straps, subway poles, sinks, commodes, and even money. An Australian manufacturer of medical implants has acquired the patent, seeing potential for using this technology to reduce the chance of post-surgical infection. Since the killing mechanism is mechanical, devices coated with nano-textures could bypass the clinical approval processes required for chemical treatments, reducing the time and cost to bring these products to market.

Additional research has revealed that clanger cicadas aren’t the only winged insects armed with antibacterial nano-patterns, nor are they the most efficient.  The cicada’s NTS only kills gram-negative bacteria, but the wings of a fiery skimmer dragonfly (Orthetrum villosovittatum) have an NTS that is equally effective at killing both gram-negative and gram-positive pathogens. 

The nano-scale needles formed by black silicon have been tested in the lab and appear to have antibacterial properties similar to those of dragonfly wings. However, scientists aren’t yet sure why nano-patterned wings provides such a powerful defense, or how to replicate it for commercial use. That should come as no surprise given the nature of warfare, on any scale. It’s the Way of the Sword, and a samurai never reveals all of his secrets.

Every summer, people complain about cicadas but if insect wing nano-pillars become the next penicillin they may change their tune. Personally, I find the droning soundtrack soothing. I like knowing that, aided by sodium-yellow streetlights, spineless samurai are keeping watching through the night. Their kokyū lullaby floats past the gingko tree leaves, slips through my window screen, and into my dreams.


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© 2018 Next-Door Nature. First published at the Center for Humans and Nature’s City Creatures blog.  Reprints welcomed with written permission from the author. Thanks to the following photographers who made their work available through the Creative Commons license: Boaz Ng, Walters Art Museum, NFG photo, Mike BitzenhoferPaul Balfe, and tami abigador pearson.

Bull Session

I say potato, you like potahtos. You wear pajamas, I wear PJs. And a rose by any other name, we’re told, would smell equally sweet. So does it really matter that we all agree on what to call an American bullfrog? 

“HELL, YEAH!” 

That’s the collective cry of taxonomists around the globe raising their voices in indignant protest. (Yes, these are men and women of strong, science-based convictions.) You see, to a biologist who studies the classification of organisms, names are not at all trivial… but they should all be binomial.

Swedish botanist Carl Linnaeus is credited with introducing this ubiquitous classification system, based on bestowing a unique two-word Latin name upon each species, precisely to avoid the kind of misunderstandings that arise when you say ersters and I say oysters.

Or, for example, when one scientist is talking about a fish using one of its common names, “dolphin” (Coryphaena hippurus, aka mahi-mahi, dorado, pompano), and another scientist hears “dolphin” and thinks of a perpetually-smiling bottlenose marine mammal (Tursiops truncatus).

And yet, despite Carl’s best efforts, disagreements persist. As in the case of the American bullfrog, whose official Latin name (Rana catesbeiana or Lithobates catesbeianus, depending on whom you ask) is more likely to be disputed and cause confusion, ironically, than its common name.

The quibble over nomenclature began about 10 years ago and quickly became a quarrel. Darrel Frost, Herpetology Curator at the American Museum of Natural History, suggested a conceptual leap that would divide members of the genus Rana, which includes bullfrogs, into nearly a dozen new genera. Many of Frost’s colleagues, unconvinced that his argument held water, refused to jump into the newly proposed systematics pond.

In response, feelings, opinions, and counter-claims have been aired publicly in peer-reviewed journals. Several years ago, a group of international researchers created a consortium to promote their own preferred adaptation of the froggy family tree. The taxonomy community still hasn’t managed to harmonize this chorus, which is why she says Rana and he says Lithobates.

But hold on… let’s not call the whole thing off just yet.Because, of course, a bullfrog doesn’t need a taxonomist to know exactly who he or she is… once s/he reaches a certain age, anyway.

Sure, there may be some gender ambiguity early on but that’s common among young amphibians. Their sex is determined genetically, although research suggests that for many frog species, exposure to environmental estrogen or variations in water temperature during tadpole-hood can induce male-to-female or female-to-male transitions. Self awareness doesn’t always come easily, and it can take some time for those gender identity questions to work themselves out. Bullfrog development is relatively slow—one to three years from egg to adult, and another two years to reach sexual maturity.

By the time they’re ready to procreate, however, males and females have definite, discernible physical differences. Males are smaller than females, their tympana (external eardrums) are larger than their eyes, and when in breeding condition their throats are yellow; female tympana are equal or smaller in size than their eyes, and their throats are white. There are behavioral distinctions as well—male bullfrogs are territorial over the summer mating season, and quite vocal about it, too; females are relatively silent, although older gals have been known to sing along with the guys. (I have a sneaking suspicion their favorite tune is If I Were A Boy.)

Ok, ok… life, in all it forms, is full of uncertainty and differences of opinion, at the laboratory bench and the water’s edge. But can we all come together on this much, at least? That the creatures featured throughout this post are:

a. Amphibians

b. Bullfrogs

c. Cool.

Everything else is neether/nyther here nor there.


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© 2018 Next-Door Nature. Reprints welcomed with written permission from the author. Thanks to the following photographers who made their work available through the Creative Commons license: Mark Beckemeyer, LadyDragonflyCC, Greg Schechter, Rick Cameron, and Kaibab National Forest.

Telephone

This university town is always less crowded during the summer. Most students are at home or on summer internships, faculty and graduate students are using the break to slip away for some R&R or doing research at field sites, and there are no home football games to bring in alumni and supporters of the opposing team.  While I enjoy the school year, and recognize how much Blacksburg depends on the university and related personnel, I do my best to pause and catch my breath from mid-May to mid-August.

That includes plenty of walks with my wire fox terrier, Dash, along a leafy section of the Huckleberry Trail, a former railroad easement. Tt’s rare for Dash and I to have the Huckleberry trail all to ourselves, at least not for very long. Usually we share with cyclists, runners, and other dog-walkers.

But one mid-July day was an exception. I guess we must have left a bit later than usual, but regardless of the reason, the trail and surrounding suburban backyards were quiet enough for me to hear a feathered fellow shouting his heart out from the power lines above.

I peered skyward and saw the black, white, and terra cotta of an Eastern towhee (Pipilo erythrophthalmus)). I’ve read descriptions of this bird’s call as “Drink your tea!” but to my ears it sounds like, “Drink your tea-hehehehe!”

I stood still for as long as Dash could stand it, enjoying the sight and sound of a serious sparrow with a major case of the giggles. Then we picked up the pace and continued walking.

 

 

Several minutes later… more giggling. Were we being followed? Most likely is was a different individual; it was breeding season, after all, and males tend not to stray far from home base and the Mrs.

 

 

 

 

Further down the trail… more tea, more giggles. I felt like I was hearing a musical baton passed from one bird to the next in an auditory relay…

 

 

 

 

Drink your tea-hehehehe!…

 

 

 

 

 

Drink your tea-hehehehe!…

 

 

 

 

 

Drink your tea-hehehehe!

 

 

 

 

I can recognize a game of Telephone when I hear it! In this case, though, all of the players were excellent listeners who repeated the phrase exactly, with perfect fidelity and zero degradation. Since garbled messages are the whole point and fun of Telephone, I wasn’t sure why all these towhees were laughing.

I’ve heard recorded birds calls I couldn’t distinguish by ear but the sonograms (graphical representations of sound) showed clear variations my hearing wasn’t sensitive enough to notice. Maybe if I had Towhee ears I’d be in on the joke.

When Dash and I returned home I had the strangest craving for a cup of tea (strange because I don’t even like tea).


Who’s playing telephone in your neighborhood?  Share your experiences and comments below! And if you’d like a little Next-Door Nature delivered right to your inbox, click the “subscribe” link in the upper right-hand corner of this page to receive notifications for new posts!

[© 2018 Next-Door Nature, Sidewalk Zendo. Reprints welcomed with written permission from the authorThanks to the following photographers for making their work available through the Creative Commons license: Pat Gaines, Alberto_VO5, devra, Mike’s Birds, Amanda, Ken Schneider, marneejill, and Keith Carver.]

Vice Squad

I was just trying to help, I swear.

In fact, the primary directive in wildlife rehabilitation is: First, do no harm. But the indignant male northern cardinal (Cardinalis cardinalis) I had just lifted out of a shoebox clearly interpreted my attempts to do a thorough but gentle intake exam as disrespectful. He spat a curse at me, and before I could blurt out an apology, he clamped that bright orange vice-like beak down on the webbing between my thumb and forefinger with more force than seemed plausible for a creature that weighed less than 2 ounces (57 g). 

There we stood—me holding him and trying not to squeeze, him holding me and trying to squeeze with all of his might. I watched a blood blister forming beneath his pincer but there wasn’t much I could do about it. Any attempt to pry him from my hand risked adding to his injuries. I could only try to remain as still as possible, take deep breaths, and wait for him to let go… even though he appeared firmly cemented in place.


Cardinals are year-round residents in much of the continental U.S., from the East Coast westward into Nebraska, Kansas, Texas, parts of New Mexico, Arizona, and southern California. Familiar and conspicuous, with an easy-to-recognize crest and stop-light bright plumage, even in winter, this species is a perennial favorite of backyard feeder enthusiasts and beginning birders. This species is known to be a courageous defender of both offspring and territory, which may be why it was chosen as the mascot for a couple of national sports teams, and for seven different states.

Songbird beaks often provide a clue, or a blatant disclosure, of the owners’ food preferences, especially if the species is a fussy eater—for example, primarily nectar, or meat, or in this case, seeds. There’s more than one way to crack a hard shell and evolution has equipped other granivores with distinctive but equally effective beak shapes. Even so, the cardinal’s short, thick, cone-shaped bill is typical of an avian seed-eater.

Which is not to imply that these black-masked bad-ass birds demand a solely grain-based diet; approximately 10% of their calories come from fruits, flowers, maple sap, and invertebrates. Moreover, their young are fed insects almost exclusively until they’re old enough to leave the nest and digest seeds.

Hatchlings cardinals don’t start life equipped with the same vice-grip their elders wear on their faces (rather than in tool belts at the waist). Given the sibling rivalry for Mom and Dad’s attention whenever they bring home groceries, it’s probably for the best that the youngsters don’t have access to pinching pliers until after they fledge; pushing and shoving are dangerous enough when the nursery is a twig cup perched precariously in the crook of a tree branch.

Eventually, the baby redbirds bills do morph into their final adult size and shape, although for a while the their adolescent nose may look out of proportion to the rest of their head. Hey, being an awkward teen is all part of growing up. It builds character, or so they say. 

With daily compulsory practice (at least if they want to eat) it doesn’t take long before those gawky bills are wielded like a finely crafted tool that quickly converts a feeder full of sunflower seeds into a pile of empty shells… or, very nearly brings a well-meaning wildlife biologist to her knees.


Back at the rehab center intake desk, the good Samaritans who had handed me the shoebox—a young mother and two small children—watched as I stood stock still, a bright red songbird pretending to be a pair of locking forceps stuck to my hand, struggling to hold back tears of pain (and four-letter words).

It’s been 20 years since I worked at the TWRC Wildlife Shelter in Houston, Texas. I’m not at all sure how long it took for the cardinal to release his grip… what feels like least a half-hour in memory was probably less than 3 minutes in real time. Luckily, there’s no scar on my hand, but my cardinal encounter did leave a lasting mark; the memory of that fierce feathered vice is riveted to my brain.

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[Thanks to the photographers who granted permission to use their photos, and to those who made their work available through the Creative Commons license: John Flannery, Fred Faulkner, Sasha Azevedo, Kenneth Cole Schneider, and John Flannery© 2017 Next-Door Nature. Reprints welcomed with written permission from the author.]