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
It’s the other way round, sharks and other fish have the tail that goes side to side, whales have the tail that goes up and down. Because whales are mammals and they have evolved from surface animals which find it easier to swim by waving their rear end up and down (humans can swim the same way).
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