Study reveals that early embryonic cells can switch roles, reshaping what we know about how fins, gills, and other body structures evolve.

Tiny pebblelike structures found in a 54-million-year-old fossilized fish eye contain the natural pigment, melanin, a study reveals. Similar structures show up regularly on fossilized feathers, hair ...

Researchers show that fish, through precise control of body fluctuations, generate movable vortex pairs of high- and low-pressure regions that enable them to swim. They used particle image velocimetry ...