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.

Biologists from the Ateneo de Manila University in the Philippines have confirmed the presence of the tinfoil barb (Barbonymus schwanefeldii), a popular aquarium fish, in Laguna de Bay, the country's ...