Whales and dolphins do not breathe autonomically like humans so have to have some part oftheir brain awake when the other part is asleep!
http://www.onegreenplanet.org/news/amazing-footage-of-sperm-whales-sleeping-vertically-video/
Toms Blog on Life and Livingness
Whales and dolphins do not breathe autonomically like humans so have to have some part oftheir brain awake when the other part is asleep!
http://www.onegreenplanet.org/news/amazing-footage-of-sperm-whales-sleeping-vertically-video/