How Do Animals That Live on Water Move

Aquatic locomotion or swimming is biologically propelled motion through a liquid medium. The simplest propulsive systems are composed of cilia and flagella. Swimming has evolved a number of times in a range of organisms including arthropods, fish, molluscs, reptiles, birds, and mammals.

What helps aquatic animals to move easily in water?

A streamlined body, webbed feet and fins help an aquatic animal to move easily in water.

Can you describe animals that live in water?

The term aquatic can be applied to animals that live in either fresh water or salt water. However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc.