So why do sharks have the tail that goes up and down but whales have the tail that goes side to side. Is there an actual reason for it or is something that just kinda happened?
In: Biology
Interestingly whales sleep unihemispherically – meaning that only half their brain (either the left or right) goes to sleep while the other half is still fully conscious and controlling half the body’s muscles.
Possibly the difference in the tail and basic swimming motion means that sharks are unable to use this form of sleep.
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