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.

Wall fountains work by combining a water pump and a water reservoir. The pump circulates water from the reservoir to the fountainhead, releasing it and cascading it down the wall. The water then flows back into the reservoir, allowing the cycle to start again. Rather, wall fountains are quite compact, electricity-powered contraptions that fit right into the decor of a home or office. Unlike fountains that shoot or spray water, a wall fountain sends water in a cascade down a flat front surface.

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.