Modern cetaceans—which include dolphins, whales and porpoises—are well adapted for aquatic life. They have blubber to insulate and fins to propel and steer. Today’s cetaceans also sport a unique type of nasal passage: It rises at an angle relative to the roof of the mouth—or palate—and exits at the top of the head as a blowhole.
Click here for original story, Now how did that get up there? New study sheds light on development and evolution of dolphin, whale blowholes
Source: Phys.org