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 the ease with which these fish can develop a biological ...

University of Washington scientists have made a remarkable discovery: real teeth growing on the forehead of a deep-sea ratfish. This finding sheds light on the unique adaptations in fish anatomy, ...

It's not what you do, it's how readily you do it. Rapid evolutionary change might have more to do with how easily a key ...