While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

The typical dorsal fin is a triangular-shaped piece of skin wrapped around muscles and bony spines or rays that sits on a ...

A tuna-shaped robot takes advantage of the real fish’s secret for speed and nimbleness: selectively folding or sticking out its fins, a feature that could improve aquatic robot designs.

but the Speartuna can be a surprisingly elusive fish to track down. Here's how to reliably find a Speartuna Fin in Monster Hunter Wilds without spending hours checking every fishing hole.

Owners should also watch out for infection and diseases such as fin rot, dropsy, and swim bladder disease. While Betta fish can tolerate dirty water for a short period, long exposure can cause ...