Aquatic Animals - Marine Animals and Aquatic Insects

An aquatic animal are those animal species which live in the water. Aquatic, marine animails are not simply the fish but comprise many species from tiny marine ivertebrates to the marine mammals like the dolphins and whales. Most aquatic animals utilize gills to extract oxygen from the wate but it isn't always the case, such as the marine mammals who must surface to breath air.

The aquatic animals, as the ground animals can carnivorous beings or herbivores according to their food. The carnivore eats the other aquatic animals and the herbivore can eat seaweed for example. Some species, as the tortoise, will have an aquatic and terrestrial life.

Aquatic animals, as fish, use gills which are of use to them for getting the oxygen in the water to allow them to breathe. Gills are not capable of working in the air and the fish dies if it is not in the water.

Many marine animals, as the dolphin or porpoise, have lungs and have to breathe of the air. The whale in a respiratory opening on the top of the head to breathe when it enters and comes out of the water in its movements. Some mammals can hold their breath for very long periods of time before having to go back up to breathe as the tortoise.

There are aquatic insects which have to lay their eggs in the water and which are going to pass of the larva to the nymph and often to become a grown-up insect capable of flying as the dragonfly.

There are animals of fresh water and aquatic animals of salt water. An animal of fresh water cannot usually survive in the salt water. The same thing for the animals of salt water. Every sort adapted itself to its environment and as a lot a dramatic change in their environment can kill them and even eliminate the sort.

To move, fishes have fins arranged in various places of their body, but their tail is their best means of propulsion. Other aquatic animals have webbed legs which are of use to them for swimming.