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African dwarf frog
African dwarf frogs, genus ''Hymenochirus'', are small aquatic frogs native to parts of Africa, spreading from tropical to subtropical areas primarily in the Congo region.
==Description==
African dwarf frogs live their entire lives underwater but need to rise to the surface to breathe air because they have lungs and not gills. These frogs are small in size and do not weigh more than a few grams. They vary in color, for the most part ranging from olive green to brown with black spots. The average life expectancy of these frogs is five years, but they can live as long as 20 years; they can grow to 6.35 cm (2.5 in) long. When young, African dwarf frogs can be mistaken and sold as African clawed frogs, of the genus ''Xenopus'', which are larger and more aggressive than the dwarf.
All species of Pipidae are tongueless, toothless, and completely aquatic. They use their webbed feet to shove food in their mouths and down their throats, and a hyobranchial pump to draw or suck food into their mouths. Pipidae have powerful legs for swimming and lunging after food. They also use the claws on their feet to tear pieces of large food. They lack true ears, but have lateral lines running down the length of their bodies and undersides; this is how they can sense movements and vibration in the water. They use their sensitive fingers, sense of smell, and lateral line system to find food. They are scavengers and will eat anything living, dying, or dead and any type of organic detritus.
These frogs have tiny black claws on their hind legs, which caused one of their discoverers, Oskar Boettger, to originally call them African dwarf clawed frogs, but they quickly lose these black tips in the sharp pebble environments and are more commonly called African dwarf frogs today.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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