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* these extraordinary noises can travel for miles under water
* these extraordinary noises can travel for miles under water
* the females nurse their calves while swimming underwater
* the females nurse their calves while swimming underwater
* the males have a unique cooling system for their internal reproductive organs
* the males have a unique cooling system for their internal reproductive organs, involving the circulation of cooled blood from the extremities directly around the [[testes]] before returning to the [[heart]]
* whales, along with humans and horses, are some of the few mammal species that do not possess [[baculum]] (penile bone)
* whales, along with humans and horses, are some of the few mammal species that do not possess [[baculum]] (penile bone)
* mysticetes have two blow-holes, while odontocetes only have one
* mysticetes have two blow-holes, while odontocetes only have one