[This reprint was originally published on January 14, 2012.]
Shorter days and Jack Frost nipping at your nose means it’s the start of the serious season, filled with snowplows, tire chains, and 10-pound sacks of clay litter that will never feel a kitty’s caress. In many parts of the northern hemisphere, it’s a long slog through snow, sleet, and freezing rain to get from December to daffodils.
Understandably, we look to Nature for role models. Native people aren’t unique in their ability to draw a connection between human and non-human animals—Madison Avenue is especially canny at choosing charismatic creatures to impersonate our enviable and endearing (or at least humorous) characteristics. Particularly at this time of year, when mercury can’t seem to bootstrap its way past 32°F, you’ll find a lot of furry sales reps pitching warm and cozy wares in magazines and newspapers, on television and online. I assume the general idea behind this trend is that raw, gray days bring out the hibernator in all of us mammals.
Not to split hairs, but that’s not technically correct. Humans don’t hibernate, but we do go through some behavioral changes at this time of year, at least so far as jobs, school, and the other routines and rituals of modern life allow. Funny, how those cold weather coping strategies make humans look strangely reptilian. Just watch—next time the Weather Channel predicts a cold front, with or without a “wintery mix,” check out all the necks and heads tucked back into Gortex shells, peeking out from fleece hoodies, swaths of scarves, and turned up coat collars as they hunch toward the warmth of home. Do you think they look more like bears, or turtles?
Now, there’s a bit of Class warfare at play here because homeothermic (body temperature largely uninfluenced by the surrounding environmental) hominid mammals aren’t often flattered by comparisons to scaly, poikilothermic (body temperature influence by the surrounding environment) cold-bloods. Knowing this, and well aware that you, dear reader, will read my claim with considerable skepticism, I’ve got an example ready to back me up: a familiar and easily identifiable semi-aquatic turtle called the red-eared slider (Trachemys scripta elegans).Even nature neophytes will immediately recognize this species, a common resident of lakes and ponds in urban and suburban parks, as well as pet stores. Shell, legs, head and tail are inscribed with stripes and nested ovals of green and yellow, the “elegant script” referenced in its Latin name (although the vibrant colors do tend to fade somewhat with age and a thick coat of algae).
The red “ear” on either side of the head distinguishes the slider from all other North American turtle species and allows for a quick and definitive ID as they sunbathe on stones and logs. “Quick” being the operative word here; sliders don’t hear well, but they are very sensitive to vibrations that alert them to the presence of potential predators, and they can slip back into the safety of the water with surprising speed.
In the wild, the slider’s life cycle begins with courtship and mating as early as March or as late as July, depending on the region and the weather. Subsequently, the female heads for dry land to deposit a clutch of eggs, excavating with her hind legs to create a nest in the soil. Then she turns for home with nary a backward glance, and the turtles-to-be she leaves behind are on their own from that point forward. Two or three months later, depending on the average ambient temperature, hatchlings emerge from the nest and set out to conquer the world.
Most of them don’t make it past the first year—such is Testudine life… and death. Those who live to see their 2nd birthday, however, can reasonably expect a couple decades of celebrations, getting bigger with each passing year (females reach 10-13 in (25-33 cm), while males max out at 8-10 in (20-25 cm)).
In addition to predation, freezing temperatures are one of the biggest barriers to longevity that young turtles must navigate in the wild (HA! I’ll bet you thought I’d lost my original train of thought on winter and hibernation, didn’t you?). No one expects to see a slider in a snowstorm, so it’s natural to assume they use sleep as a survival strategy. Hey, it works for two of the most diverse Orders on Earth—Chiroptera (bats) and Rodentia (rodents)—so why not?But reptiles take a different road.
Brumation is a period of decreased activity, but it doesn’t involve the extreme metabolic changes that occur during hibernation. ‘Round about October, as temperatures dip below 50°F, sliders begin to settle in at the bottom of their preferred body of water, or in some cases under stream banks and tree stumps, and just… hang out. They’re less social, they move a little more slowly, sleep a little later, watch more television (I’m sure there must be a turtle equivalent), and generally feel lethargic and unmotivated. On warmer days, they’ll drag themselves up from the depths to stretch their limbs, have some lunch, and catch some rays with a few friends… but as soon as old Sol goes into hiding they follow suit, retreating into their shells to become stick-in-the-muds until spring.
Social commentators have come up with any number of marketable catch phrases to describe the human desire to turn our backs on a less than hospitable world—cocooning, burrowing, vegging out, even hibernating. The admen (and women) may argue that it doesn’t have the same sizzle, but what we’re really talking about here is brumating.
Sound like anyone you know?
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© 2012 Next-Door Nature—no reprints without written permission from the author (I’d love for you to share my work; all you have to do is ask). Thanks to these photographers for making their work available through a Creative Commons license: Charles Lam, Asterio Tecson, Jim, the Photographer, Alan Vernon, and Jack Wolf.