The best-known European tree-frog is less than two inches long. Its Latin name is Hyla arborea. Its color is usually bright green. But tree-frogs can change color even as you watch them. They can become yellow, brown or black.
In North America there are two main types of tree-frog. One is called the spring peeper. It has a shrill piping voice. The other one is known as Hyla versicolor.
Versicolor is a Latin word meaning various colors. This frog can be gray, green or brown. It has loud croaking voice.