Tree Frog
in zoölogy, any individual of the family Hylidæ. They are of small size, more elegant in form than the true frogs, of brighter colors, and more active habits. They feed on insects, which they pursue on the branches of shrubs and trees. The European tree frog (Hyla arborea) is common in the middle and S. of the Continent, and ranges into Asia and the N. of Africa. It becomes very noisy on the approach of rain, and is often kept in confinement as a kind of barometer. The common tree frog of North America is Hyla versicolor, replaced in the S. by the green tree frog, H. viridis.