Manta rays didn't react with social behavior when they saw themselves in mirrors.
It's not just humans, sheep, dogs, and horses that can recognize faces.
For years, scientists have been trying to figure out the nature of the relationship between cleaner fish and their clients.
DId you know your brain has an 'alerting system'? When it detects a change, it can trigger eye and head movements to gather more information.
All land vertebrates evolved from fish, and Acanthostega—the fossil of a part-fish, part-amphibious creature—pinpoints how we made the leap from water to earth.
Fish navigate through turbulence by slaloming between whirlpools of water.
Forget sharks, piranha should be the reason you're afraid to go near the water.
Sexy swordfish have figured out how to go a-courting without courting disaster.
The dusky dottyback is dressed to kill: It shape-shifts to look like its prey and goes in for the attack.
When frozen in water, fish remain in a state of suspended animation until spring melts the ice away.