A small fossil reveals that the largest freshwater fish, Otophysans, emerged in the sea, not in rivers, changing the ...

The snipe eel (right) and anglerfish illustrate the extremes of body shapes in deep ocean fishes. (Images from Scripps Institute of Oceanography via Oceana.org) The deep ocean is home to many strange ...

Fish, the most biodiverse vertebrates in the animal kingdom, present evolutionary biologists a conundrum: The greatest species richness is found in the world’s tropical waters, yet the fish groups ...

As life on earth evolved, billions of creatures made the move from primordial ooze to life on land. For most, that eons-long transformation was a one-way trip. With the exception of amphibians—which ...