Bettas are one of the most popular fish species. Most people consider them relatively active, but this isn’t always true.

But over time, many fish have evolved different uses and appearances for these skin flaps. Some dorsal fins look like a ...

A video of the fish appearing on the beach has over nine ... shorts goes up to a silver creature with its translucent orange fins to rescue it. The oarfish, known in Japanese mythology as Ry ...

Their streamlined torpedo shape helps them gather enough underwater speed to break the surface, and their large, wing-like pectoral fins get them airborne. Flying fish are thought to have evolved ...