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Approximately 4,740 species of frogs exist in the world. Frogs are found on all continents except for Antarctica. More than 120 species of frogs have become extinct since 1980. More »

Frogs have bilateral symmetry. Most animals, including humans, have bilateral symmetry. This means that when the animal is cut in half down the middle, two practically identical pieces are produced. However, when cut in ... More »

All frogs begin their lives as tadpoles that breathe underwater using their skin and gills. As the frog grows, lungs begin to develop and the frog loses its gills at it begins to metamorphose. More »

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The lifespan of frogs varies significantly depending on species and habitat. The oldest frog ever recorded was a European common toad that lived for 40 years. A measurement of skeleton growth in wild mountain yellow-legg... More »

Tree frogs are different species of frogs that spend most of their lifespans on trees. They have evolved in such a way that they rarely, if ever, need to leave their arboreal state. More »

www.reference.com Pets & Animals Amphibians Frogs

Most frogs are nocturnal, such as the leopard frog and American green tree frog; however, there are species that prefer daytime living, such as dart frogs. Each species is adapted to its preferred diet and environment, a... More »

The poison-dart frog, the common name assigned to over 175 known species of the Dendrobatidae family of frogs, is endemic to the humid, equatorial zones within South and Central America. Habitats range from freshwater la... More »