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European spadefoot toad
The European spadefoot toads are a family of frogs, the Pelobatidae, with only one extant genus ''Pelobates'', containing four species. They are native to Europe, the Mediterranean, northwestern Africa, and western Asia.
== Description ==
The European spadefoot toads are small- to large-sized frogs, up to in length, which are often inconspicuously coloured. They are predominantly fossorial (burrowing) frogs, which burrow in sandy soils. They have hardened protrusions on their feet to aid in digging, which is the source of the common name. They emerge from the ground during periods of rain and breed in pools, which are usually temporary.〔
All of the species from this family have free-living, aquatic tadpoles. The eggs are laid in temporary ponds that may quickly evaporate, so the tadpole stage is unusually brief, with rapid development to the adult form in as little as two weeks. To further speed their growth, some of the tadpoles are cannibalistic, eating their brood-mates to increase their supply of protein.
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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