Hundreds of thousands of Velella velella, more commonly known as by-the-wind-sailors, are drifting onto the coastline.

A new review of ocean data suggests that more than 99.999 percent of the global deep seafloor has never been seen by humans.

Watch 10 biggest ocean creatures ever captured on film.

These spiny or slimy ocean creatures display an astonishing diversity of appearances, behaviors and lifestyles—and many are ...

For our new study, we reviewed the literature on the movements of marine migratory species from 1990 to 2017. We synthesised ...