Japanese tree frog (English name) Hyla japonica

Japanese: ニホンアマガエル（英語表記）Hyla japonica

A small tree frog (illustration) of the Hylidae family. Distributed throughout Hokkaido, Honshu, Shikoku, and Kyushu, it is commonly seen in plains, low mountain forests, around rice paddies, and in residential yards and hedges. It lives on grass and shrubs, and does not enter water except during breeding season. It is about 3-4 cm long, with females being slightly larger. It has well-developed suckers on the tips of each finger of its four limbs, allowing it to jump out in search of insects and spiders, and to land lightly on branches and leaves. It is a good example of protective coloration due to its skillful body color change, changing from yellow-green to gray-brown to dark brown depending on the surrounding conditions, and dark spots appear on its back and limbs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

アマガエル科の小さなカエル（イラスト）。北海道，本州，四国，九州に分布し，平地から低山地の林，水田周辺から人家の庭先や生垣までふつうに見られ，草の上や低木にすんで，繁殖期以外は進んで水に入ることがない。体長約3～4cmで雌がやや大きい。四肢の各指先には吸盤が発達し，餌の昆虫，クモなどを求めて跳び出しても，枝や葉に身軽に止まることができる。体色変化が巧みで保護色の好例とされ，周囲の状況に応じて黄緑色から灰褐色，暗褐色まで変わり，暗色の斑紋が背面や四肢に現れる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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