Hairless Cetaceans Are Naked For A Reason
These hairless cetaceans are the largest group of hairless mammals, including whales, dolphins, and porpoises. This makes sense, as hair is not helpful for aquatic life. Instead, these creatures insulate themselves with a thick layer of blubber.
Although all cetaceans exhibit hair on their heads as fetuses, it is eventually lost. Baby dolphins have whiskers in utero, but they shed them after birth. A few species are exceptions to this, like the bowhead whale, which has hairs on its lips, chin, and snout, and blowhole.