African clawed frog

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A medium-sized frog (Xenopus laevis) native to sub-Saharan Africa, having claws on the three hind inner toes, a mottled olive or brown body, and no tongue or eyelids. It is widely used for biological research and is also kept as a pet.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A clawed frog found in southern Africa, taxonomic name Xenopus laevis, that has some properties very useful for genetics.