Blowhole (biology)

From Freepedia

In biology, a blowhole is the hole at the top of a whale's head through which the animal breathes air. It is homologous with the nose of other mammals. As whales reach the water surface to breathe, they will forcefully expel air through the blowhole. The exhale is released into the comparably lower-pressure, colder atmosphere, and any water vapor condenses. This is often visible from far away as a white splash.