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Alternative Title: Salientia Anura, also called Salientia, one of the major orders of the class. It includes the and, which, because of their wide distribution, are known by most people around the world. The name frog is commonly applied to those forms with long legs and smooth, -covered skins, toad being used for a variety of, short-legged anurans, especially those with rough skins. The name toad is applied so unevenly that one member of a family may be called a toad and a closely related member a frog.

The familiar members of the family Bufonidae may be distinguished as “true toads.” In this article, frog is applied generally to members of the Anura and toad to those for which it has traditionally been used. There are roughly 5,400 species of living anurans. Painted reed frog Painted reed frogs ( Hyperolius viridiflavus). © Digital Vision/Getty Images Frogs are used as teaching tools from through college.

Barbie Horse Adventures Riding Camp Pc Game more. Vox Tonelab Le Manual more. One of the first lessons many children receive is through the rearing of the, known as or pollywogs, in classes. Windows Vista Lite 64 Bit. Students become familiar with frog and in biology courses. People in various parts of the world eat frog legs, and some kinds of toads are used in insect control.

Certain South American Indians use the poisonous secretions of some kinds of frogs for arrows and darts ( see ), and now biochemists are studying the possible medical uses of the of the poison. The biologist interested in finds a vast array of interesting and often perplexing problems in the study of frogs, such as the relatively sudden decline of many frog species since the late 20th century. Edible frog ( Rana esculenta). Copyright Stephen Dalton/Photo Researchers General features Size range and diversity of structure Although all are readily recognizable, there are great varieties of sizes and of structural modifications. Many frogs are tiny animals; perhaps the smallest is the Brazilian Psyllophryne didactyla, adults of which measure 9.8 mm (0.4 inch) or less in body length (with legs drawn in), whereas the West African, Conraua goliath, has a body length of nearly 300 mm (12 inches). Many anurans have smooth, moist.

Toads of the genus Bufo are familiar as “warty” amphibians, the skin being highly glandular and covered with tubercles (small, round nodules). Frogs of many other families have rough, tubercular skins, usually an for life in the less humid. The opposite extreme is found in the small arboreal (tree-dwelling) frogs of the tropical American family, in which the skin on the underside is thin and transparent, and the heart and viscera can be seen through the skin. In most species, cutaneous gas exchange (that is, breathing through the skin) supplements the oxygen taken in by the lungs; however, the lungless Barbourula kalimantanensis of Borneo obtains all its oxygen through its skin. Most frogs move. The long and powerful hind limbs are straightened rapidly from the crouching position, propelling the frog through the air.