Scientists have uncovered the secret of the Amazon molly, an all-female fish species that has survived for 100,000 years through cloning, defying long-held evolutionary theories.

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The fox froze. Inches from his paws, frenzied, spawning carp writhed in the shallow water along a reservoir’s shore. In a sudden flash of movement, the fox dove nose-first into the water, emerging ...

A new study explains how small genetic changes enabled electric fish to evolve electric organs. The finding might also help scientists pinpoint the genetic mutations behind some human diseases.

Electric organs help electric fish, such as the electric eel, do all sorts of amazing things: They send and receive signals that are akin to bird songs, helping them to recognize other electric fish ...