The sea mammals may actually be able to sense the amount of oxygen in their blood—something we humans can't do.

The U.K. is home to more than a third of the world's gray seals (Halichoerus grypus). Their increase, since the cessation of ...

The finding suggests gray seals (Halichoerus grypus) perceive their own blood oxygen levels, an ability that prevents them from drowning on dives that can last up to an hour. Mammals need oxygen ...