Gray Treefrogs are often heard but rarely seen, due both to their cryptic coloration as well as the fact that they are arboreal. They tend to perch (grasping trees with their toes which bear large, adhesive, mucous-secreting disks at their tips) in vegetation surrounding swamps and ponds, where their robust, territorial and mating trilling can be heard (males call between 500-15,000 times per hour). To hear trilling Gray Treefrogs go to https://www.youtube.com/watch?v=CSkhM24Fi-k.
After choosing a mate and mating, Gray Treefrog females lay up to 2,000 eggs which hatch in 2-5 days. For the next month or two the tadpoles breath with gills and consume vegetation. Full-sized tadpoles are green or black with red or orange tails. Towards the end of summer, the tadpoles begin their transformation into frogs, developing limbs and lungs, absorbing their tails and changing from a diet of plants to one of insects.
Adult Gray Treefrogs are mottled gray or green (depending on their surroundings, temperature, and humidity) and have an uncanny resemblance to lichen. Recently-metamorphosed young treefrogs such as the one pictured are a brilliant emerald green. (Photo: young Gray Treefrog with adult Gray Treefrog inset) (Thanks to Brian Long for photo op.)
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