A massive research initiative to explore deep-sea creatures brought discoveries to light in the northern Pacific Ocean last year, when scientists filmed and captured three fish at depths never ...

All fish share two traits: they live in water and they have a backbone—they are vertebrates. Apart from these similarities, however, many of the species in this group differ markedly from one another.

Flying fish can be seen jumping out of warm ocean waters worldwide. Their streamlined torpedo shape helps them gather enough underwater speed to break the surface, and their large, wing-like pectoral ...