The rockhead poacher is a little fish with a big pit in its head. The divot may be like a drum, making sound that rises above ...

A clever tropical fish has flipped how biologists are thinking about memory, brains and visual recognition in the animal ...

Vitamin D is a fat-soluble vitamin critical for bone growth and cell development. Rainbow trout, salmon, sardines, tuna, mackerel, and herring are good sources.

The ocean sunfish looks like an evolutionary mistake: no tail, no ribs, no axial swimming muscles, and a body that appears ...