We know marine mammals like dolphins need air to breathe, but what happens when they rest? The solution is a fascinating form of half-sleep that allows them to emerge for air without waking up. Dive into the weird world of underwater slumber.
Nov 3, 20173 min
Nov 3, 2017
English (United States) (CC)
Closed captions (CC) refer to subtitles in the available language with the addition of relevant non-dialogue information.