Frogs

Frogs can drink without opening their mouths, soaking up water through their thin, permeable skin. That same skin makes them sensitive to pollution, which is one reason scientists watch frog populations as a sign of a healthy environment. Most frogs begin life as aquatic tadpoles with gills and tails before transforming into air-breathing, four-legged adults.

Follow that transformation in our guide to the frog life cycle, meet brightly colored rainforest species like the poison dart frog, or compare climbers such as the White’s tree frog with ground-dwelling common toads. Profiles cover habitat, diet, calls and care for popular pet frogs.