The four different “Frog” stamps are offered in a booklet of 20 the Pacific tree frog, the northern leopard frog, the American green tree frog, and the squirrel tree frog.

More than 4,000 species of frogs are found in all continents except Antarctica, and more than 90 species are found here in the United States. Frogs play an important role not only in their natural habitat, but in our daily lives. As tadpoles, they feed on algae, which helps keep the water clean; as adults, they feed on insects, which helps to control bug populations.

Typically bright green, the American green tree frog (Hyla cinerea, lower left) grows to be no larger than two and a half inches long. Known to live as far north as Delaware and Illinois, this frog can be found in ponds, lakes, and swamps throughout the southeastern United States and along the Gulf Coast, where its call is one of the most distinctive in its range. Because the American green tree frog forms large choruses after warm rains, it is sometimes called the rain frog, but others have dubbed it the cowbell frog based on the sound of its short call when heard from a distance.