Whales are mammals. They bear live young and feed them milk and they have lungs. They breathe air through a blow hole at the top of their heads. Whales often travel in groups or pods. They can be found in all the world's oceans! Open Wide There are two groups of whales.
Whales and dolphins are mammals and breathe air into their lungs, just like we do. They cannot breathe underwater like fish can as they do not have gills. This allows them to take breaths by exposing just the top of their heads to the air while they are swimming or resting under the water. Large whales have two blowholes with the exception of the sperm whale whereas dolphins have just one. When a dolphin surfaces for air, he breathes out exhales first and then breathes in inhales fresh air; it only takes a fraction of a second for the dolphin to do this. The blow is the sound you hear, and the spray of water you see, when the dolphin forcefully breathes out and clears away any water resting on top of his blowhole.
In cetology , the study of whales and other cetaceans , a blowhole is the hole or spiracle at the top of the head through which the animal breathes air. In baleen whales , these are in pairs. It is homologous with the nostril of other mammals , and evolved via gradual movement of the nostrils to the top of the head.
In Herman Melville's classic novel, a Sperm whale called Moby Dick is protrayed as an evil monster which sinks ships and kills sailors. This is the reputation these whales have gotten throughout the years, perhaps because of their large size and huge teeth. We now know that Sperm whales are not dangerous to people. They do not break ships apart and swallow sailors whole.