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So How Can They Sleep and Not Drown? Observations of Bottlenose Dolphins in Aquariums and Zoos, and of Whales and Dolphins in the Wild, Show Two Basic Methods...
So how can they sleep and not drown? Observations of bottlenose dolphins in aquariums and zoos, and of whales and dolphins in the wild, show two basic methods of sleeping: they either rest quietly in the water, vertically or horizontally, or sleep while swimming slowly next to another animal.
Can a blue whale breach?
The largest species of whales rarely breach: blue whales and sei whales almost never breach (Whitehead, 1985b), while fin whales breach rarely and frequent breaching may be confined to specific populations (Marini et al., 1996).
Why do whales fluke dive?
Breach. The whale uses its tail to propel part of, or all of its body out of the water and comes down with a splash. Some believe that this is a form of communication between whales others believe it is used to rid the whale of parasites.