Gray Treefrog (Dryophytes versicolor) or Cope's Gray Treefrog (Dryophytes chrysoscelis)
Order: Anura; Family: Hylidae; Genus: Dryophytes. These are typical members of the treefrog family characterized by specialized adhesive toe pads.
Species
Gray Treefrog (Dryophytes versicolor) or Cope's Gray Treefrog (Dryophytes chrysoscelis)
Family
Order: Anura; Family: Hylidae; Genus: Dryophytes. These are typical members of the treefrog family characterized by specialized adhesive toe pads.
Size
Adults typically range from 1.25 to 2 inches (3.2 to 5.1 cm) in SVL. Females are generally larger than males. They are larger than spring peepers but smaller than bullfrogs.
Conservation
Listed as Least Concern (IUCN). Populations are stable and they are quite resilient to suburban development as long as trees and breeding ponds remain.
Description
An master of mimicry, this frog looks like a patch of living lichen. In the photo, it has adopted a pale, high-contrast gray pattern to match its surroundings, showcasing its incredible ability to blend into textures of wood and stone.
Key Features
Warty skin, large toe pads, light spot under the eye, and bright orange 'flash colors' on the inner thighs.
Physical Description
A robust, medium-sized treefrog with a somewhat flattened body profile. It has large, prominent eyes with horizontal pupils and a clearly visible tympanum (eardrum). The limbs are relatively short compared to slender hylids, ending in distinct, enlarged toe pads.
Skin Texture & Coloration
The skin is noticeably granular or warty, giving it a lichen-like texture. Coloration is highly variable (hence 'versicolor'), ranging from bright green to pearl white or dark gray with irregular black blotches. The inner thighs, hidden at rest, are bright yellow or orange.
Distinguishing Features
Large adhesive toe pads, granular skin, and a light-colored square spot directly beneath each eye. The most definitive feature is the bright yellow/orange wash on the hidden surfaces of the hind legs.
Habitat
Arboreal specialists found in deciduous forests, swamps, and suburban backyards. They prefer areas near permanent or semi-permanent water sources for breeding but spend much of their time high in the canopy.
Geographic Range
Native to the eastern United States and southeastern Canada, extending from the Atlantic coast west to the Great Plains.
Behavior
Nocturnal and highly cryptic. During the day, they remain motionless on tree bark or man-made structures (like the deck in the image) where their camouflage is most effective. They are excellent climbers.
Diet & Feeding
primarily insectivorous, consuming spiders, moths, beetles, and ants. They use a sit-and-wait ambush strategy, lunging with a sticky tongue to capture prey.
Reproduction
Breeds in spring and summer. Males congregate near water and call to attract females. Eggs are laid in small clusters or loose masses attached to vegetation near the water surface.
Vocalizations
The two species are best distinguished by call: D. versicolor has a slower, melodic trill, while D. chrysoscelis has a faster, harsher, more metallic trill.
Life Cycle
Eggs hatch into tadpoles with high-finned tails that often develop reddish coloration if predators are present. Metamorphosis occurs in 45-65 days. They can live 5-7 years in the wild.
Conservation Status
Listed as Least Concern (IUCN). Populations are stable and they are quite resilient to suburban development as long as trees and breeding ponds remain.
Toxicity & Defense
Produces skin secretions that can be irritating to mucous membranes (eyes/nose). The bright orange inner thighs serve as flash coloration to startle predators during a jump.
Ecological Role
High-level insect predator in the forest canopy and a vital 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 (tetraploid vs. diploid).
Observation Tips
Look for them on porch lights at night or listen for their trilling calls on warm, rainy evenings near ponds. During the day, check tree trunks and verticle surfaces for 'lumps' that look like lichen.
Handling & Safety
Safe to move gently but wash hands afterward to avoid irritating eyes with skin secretions. Always use wet hands to protect their sensitive, permeable skin.
Seasonal Activity
Active from early spring through autumn. They spend the winter buried in leaf litter or under bark in a state of brumation.
Cultural Significance
Commonly encountered by homeowners, they are the 'sound of summer' in the eastern US. They often appear on windows at night to hunt insects attracted to lights.
Interesting Facts
These frogs are cold-tolerant and produce glycerol in their blood, acting as a natural antifreeze that allows them to survive partial freezing during winter hibernation.