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.

Found from southeastern Virginia down through Florida and west along the Gulf Coast to Texas, the squirrel tree frog (Hyla squirella, upper left) earns its name from a raspy, quack-like call that resembles the scolding noise of a gray squirrel. Its coloring varies greatly from brown to rich green. Growing no larger than one and five-eighths of an inch long, this little frog is often spotted when it hunts for insects at night among patio lights. On summer evenings, large choruses of squirrel tree frogs form in pools and roadside ditches.