Gray Treefrog (Dryophytes versicolor) lives in moist woodland across Eastern North America. It feeds on insects and spiders. Its conservation status is Least Concern.
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Gray treefrogs can flip their skin from nearly black to nearly white, letting them melt into anything from a dark bark to a sun-lit leaf. This chameleon-like trick, hinted at by their name versicolor, lets them hide from predators by matching gray, green or brown surroundings. By shifting hue, they stay safe.
At just 1.5 to 2 in (3.8 to 5.1 cm) long, the gray treefrog, yet it carries a double set of chromosomes, 48. This tetraploid genome makes it a "tetraploid gray treefrog" in scientific papers and separates it from its diploid cousin, Cope's gray treefrog. The extra chromosome set influences its development and hybrid viability, highlighting how genome duplication can shape a species' identity.
Gray treefrogs can survive the freeze of their own body fluids down to -8 °C (18 °F). However, infection by the deadly fungus Batrachochytrium dendrobatidis raises their critical temperature minimum, weakening this freeze tolerance and increasing winter mortality.
A male gray treefrog's call pulses at 16 to 34 pulses per second, about half the speed of its close relative, Cope's gray treefrog. Because pulse rate shifts with temperature, the two species can still be told apart even when they share a pond. This temperature-linked rhythm lets each frog keep its mating signal distinct.
Under optimal conditions, gray treefrog tadpoles can finish metamorphosis in just two months, emerging as tiny froglets that flash green for a day or two before turning the familiar gray. Their bright-yellow patches on the hind legs, only visible while jumping, set them apart from other treefrogs.
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In the misty veil of a summer evening, the gray treefrog emerges, its slender form weaving through the leafy underbrush with an air of quiet purpose, as if drawn by an unseen thread to the symphony of sounds that fill the night air. With eyes like shining jewels, it navigates the intricate tapestry of its forest home, its mottled skin blending seamlessly into the dappled light and shadow, a master of stealth and deception. As it leaps from branch to branch, its sticky pads barely making a whisper on the bark, the gray treefrog embodies the very essence of arboreal elegance, a tiny, green-gray monarch of the treetop realm.
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