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Common Tree Frog — Part 4
Hyla arenicolor resembles the Common Tree Frog (Hyla versicolor) in general appearance and colouring, but is less attractive. The frog is more clumsy, the outlines less delicate, the eyes are smaller, and the colouring is duller. It is somewhat more active than Hyla versicolor and leaps greater distances, as we should expect from the greater length of its legs.
Its call consists of a series of short notes resembling the bleating of a goat. The throat-sac of the male, inflated during the calling, is dark coloured and large. The throat of the female is white, with spots of dark. Both male and female give a sharp high-pitched cry when taken in the hand.
The colour is rapidly changeable from grey or brown so dark that it is nearly black, through distinctly spotted phases, to a pinkish or greyish unspotted white.