Cuttlefish flash patterns and colors on their skin to communicate, and they may wave their tentacles to send visual and ...

Explorers descended into a 500-foot-deep cave—only to find something even more mysterious below: a perfectly blue, seemingly bottomless hole. Learn what makes this rare geological formation so ...

The Indonesian coelacanth, a fish once thought to be extinct for 70 million years, was discovered alive in greater numbers ...