Most carnivores have teeth to grasp and eat prey, so marine animals with teeth are not uncommon. Sharks, dolphins, eels, whales, many fish species, and marine mammals like seals and sea lions have ...

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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 ...

A juvenile spotted ratfish. These deep-sea fish are named for their long, rat-like tails. Gareth J. Fraser, University of Florida Deep in the ocean, you can find a strange fish with teeth not just in ...

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 innovation can be gained or lost rather than with the innovation itself, ...