In a river of southern Vietnam, a 3-foot-long creature with “large” teeth maneuvered through the brackish water — or tried to, at least. But something closed around the wrinkly animal and pulled it ...

Fish can change their teeth quickly, which speeds up their evolution. Cichlids in African lakes show the fastest ...

The US National Park Service announced the identification of a new species of ancient shark, Clavusodens mcginnisi, ...

A new study shows that the ease with which these fish can develop a biological innovation (complex teeth), not just the innovation itself, enables this rapid evolution. (Photo of Nimbochromis ...

Complex teeth with multiple cusps in an African cichlid fish. The cichlid fish of Africa's Great Lakes have formed new species more rapidly than any other group of vertebrates. A new study shows that ...

A tiny shark species dating back hundreds of millions of years has been identified at Mammoth Cave National Park in Kentucky, the National Park Service said.

A new study shows that the ease with which these fish can develop a biological innovation (complex teeth), not just the innovation itself, enables this rapid evolution. It’s not what you do ...

Adaptations of the teeth and jaws that allow the fish to adapt to a wide range of food sources and habitats are thought to be a factor in their success. Fish, including cichlids, have either ...