Gray Treefrog (Dryophytes versicolor) / Cope's Gray Treefrog (Dryophytes chrysoscelis)
Order Anura, Family Hylidae, Genus Dryophytes. These are typical 'true treefrogs' characterized by specialized toe pads for climbing.
Species
Gray Treefrog (Dryophytes versicolor) / Cope's Gray Treefrog (Dryophytes chrysoscelis)
Family
Order Anura, Family Hylidae, Genus Dryophytes. These are typical 'true treefrogs' characterized by specialized toe pads for climbing.
Size
Adults typically measure between 1.5 to 2.4 inches (3.8 to 6 cm) in snout-to-vent length (SVL). Females are generally larger than males.
Conservation
IUCN Status: Least Concern. Populations are generally stable and and they are highly tolerant of human-altered landscapes.
Description
A master of disguise, the Gray Treefrog blends perfectly with lichen-covered bark. In this image, it is seen resting on a window ledge, likely waiting for nightfall to hunt insects attracted to the light. Its bumpy skin and mottled pattern provide exceptional camouflage against natural backgrounds.
Key Features
Large toe pads, warty skin texture, white spot under the eye, and bright yellow/orange inner thighs.
Physical Description
A robust, medium-sized frog with a somewhat flattened body. It features large, protruding eyes with horizontal pupils and notably large, circular toe pads. The tympanum (eardrum) is visible and smaller than the eye.
Skin Texture & Coloration
Skin is distinctly granular or 'warty.' Color is highly variable (chameleon-like), ranging from lichen-green to slate gray or brownish-gray. The dorsal surface usually features darker, irregular blotches. A white spot is typically present under each eye.
Distinguishing Features
Large toe pads; a bright yellow or orange wash on the hidden inner surfaces of the hind legs ('flash colors'); a light spot beneath the eye; and a dark-edged pattern on the back.
Habitat
Highly adaptable, found in deciduous forests, woodlots, and swamps. They are frequently found near suburban homes on siding, windows, or fences where porch lights attract insect prey.
Geographic Range
Common throughout the eastern United States and southeastern Canada, from Manitoba to Texas and east to the Atlantic coast.
Behavior
Primarily nocturnal and arboreal. During the day, they hide in tree cavities or under loose bark. They use 'flash colors' on their thighs to startle predators when they leap.
Diet & Feeding
Insectivorous specialists. They sit-and-wait for beetles, moths, crickets, and spiders. In suburban areas, they frequently hunt on glass windows to catch insects attracted to indoor light.
Reproduction
Breeding occurs from spring to mid-summer, usually triggered by heavy rain. Use axillary amplexus. Eggs are laid in small clusters attached to vegetation in shallow, temporary or permanent water.
Vocalizations
The two species are best distinguished by call: D. versicolor has a slower, melodic trill, while D. chrysoscelis has a faster, harsher metallic trill. Temperature significantly affects pulse rate.
Life Cycle
Eggs hatch in 3-7 days. Tadpoles have distinctive reddish or orange-tipped tails to distract predators. Metamorphosis occurs in 45-65 days. Adults can live 7-9 years in the wild.
Conservation Status
IUCN Status: Least Concern. Populations are generally stable and and they are highly tolerant of human-altered landscapes.
Toxicity & Defense
The skin produces a toxic secretion that can be irritating to human mucous membranes (eyes/mouth), causing a burning sensation. It is not life-threatening but effective against small predators.
Ecological Role
Serves as a vital mid-level predator of forest invertebrates and a food source for birds, snakes, and larger mammals.
Similar Species
The Gray Treefrog and Cope's Gray Treefrog are identical in appearance (cryptic species) and can only be reliably distinguished by their calls or chromosome counts (one is diploid, the other tetraploid).
Observation Tips
Check windows or siding near outdoor lights on warm, humid nights. During the day, look for them tucked into crevices or on tree trunks where they look like knots of wood.
Handling & Safety
Avoid touching your eyes or mouth after handling due to skin secretions. Always wash hands thoroughly. Use wet hands if handling is necessary to protect the frog's permeable skin.
Seasonal Activity
Active from early spring through autumn. They spend the winter in a state of brumation, buried in leaf litter or tucked under logs where they may partially freeze.
Cultural Significance
Often referred to as 'rain frogs' in folklore because their territorial calls are frequently heard during humid weather or before summer storms.
Interesting Facts
These frogs are extremely cold-tolerant; they can survive being frozen during winter by producing glycerol in their blood, which acts as a natural antifreeze.