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 throughout the western United States, the Pacific tree frog or Pacific chorus frog (Pseudacris regilla, pictured at lower right) grows no larger than two inches in length and may be one of the world’s most widely heard frogs. Nicknamed the “Hollywood frog,” its calls—rib-bit, rib-bit—have been recorded for use as background noise for nighttime scenes in countless television shows and movies, even those set far from the frog’s actual range.