Alien fish are already strange, but watching one face off against a live blue crawfish was next level. The clash of colors ...

Somewhere in the ocean's depths swims a small fish with a see-through skull, tubular eyes, and visual tricks that break every rule biology textbooks lay down about how vertebrates see.

A searobin 'walks' on the seafloor, using modified fin-ray appendages. (NOAA Office of Ocean Exploration and Research) The ...