This is mainly because they tend to breathe the fresh air and ejects carbon dioxide. The hole which ejects water is called a ''blow hole''. And when they breathe air out of it, it appears like a fountain of water. Blowholes are surrounded by muscles that keep them closed when they are underwater.

A traditional fountain is an arrangement where water issues from a source (Latin fons), fills a basin of some kind, and is drained away. Fountains may be wall fountains or free-standing. In fountains sheets of water may flow over varied surfaces of stone, concrete or metal. A fountain, from the Latin "fons" (genitive "fontis"), meaning source or spring, is a decorative reservoir used for discharging water. It is also a structure that jets water into the air for a decorative or dramatic effect.

The Mushroom Fountain Nozzle has an adjustable top that creates a clear sheet of water in a mushroom or bell shape. It has the best effect under wind-less conditions, and water volume can be adjusted by. It has the best effect under wind-less conditions, and water volume can be adjusted by installing the valve. A fountain, from the Latin "fons" (genitive "fontis"), meaning source or spring, is a decorative reservoir used for discharging water. It is also a structure that jets water into the air for a decorative or dramatic effect.