Japanese Tree Frog (Hyla japonica) — identification, habitat & look-alikes

The Japanese Tree Frog is native to northeastern Asia, not the United States. It can shift from leafy green to gray-brown, but the dark stripe from the nostril through the eye usually remains a useful clue.

Appearance

Appearance: Males are about 0.9–1.5 in (22–39 mm) long and females about 1.0–1.8 in (26–45 mm). The back can be green or gray-brown, the belly is pale, and rounded help it climb.
Voice: Breeding males inflate a single throat pouch and give repeated, sharp calls.

Look-alikes

Gray TreefrogHyla versicolor

The U.S. Gray Treefrog has a pale spot below each eye and bright yellow inner thighs, often with dark mottling. The Japanese Tree Frog instead has a dark stripe running from the nostril through the eye toward the shoulder.

Why they get mixed upBoth can change between green and gray-brown and have large toe pads.

Where it lives

Typical habitats: rice paddies and marshes
pond edges
meadows and forest edges
Range: Its native range includes the Korean Peninsula, southwestern Japan, northeastern China, Mongolia, and the Russian Far East. It is not native to the United States.
Preferred conditions: It uses vegetation around shallow, still water for breeding and also lives in meadows, shrubland, and mixed or deciduous forest.

Behavior

Diet: Adults eat insects and spiders.
Activity: Its color can change with the surroundings, so color alone is not a reliable field mark.

Life cycle

Nest: Females place small groups of eggs in shallow, still water among vegetation.

Name and classification

About the name: Previously called Hyla japonica, it is now classified as Dryophytes japonicus. A 2025 revision separated eastern Japanese populations as Dryophytes leopardus, so older accounts may include both.

Conservation

IUCN Red List: LCLeast ConcernLow risk of extinction

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