Dolphins

Dolphins are aquatic mammals (mammals that spend part or all of their lives in the water).

Dolphins belong to the family of cetaceans which includes aquatic animals like whales and porpoises.

They breathe air: dolphins utilize their lungs to breathe just like humans do, coming to the surface to do so. Fish breathe through their gills.
Dolphins are mammals because they make milk for their young, something fish don't do.
Like other mammals, dolphins have warm blood, as opposed to fish, which has cold blood. Having warm blood means that your body maintains a relatively constant body temperature above your surroundings rather than having the same temperature as the outside world.
Dolphins give live birth to their young; unlike fish, which lay eggs, they give birth to their offspring live, exactly like humans and other mammals do.

A pod or school of dolphins is a group of them that gets all the water they require from the fish they consume.

Male dolphins are known as bulls, while female dolphins are known as cows, and young dolphins are known as calves.

Dolphins have melon-shaped skulls with a noticeable protrusion. That is brought on by a wax and liquid fat-filled organ called the melon that all toothed whales possess. Although its exact function is still unknown, it plays a significant role in communication and echolocation by acting as a sound lens to focus and modulate the dolphins' clicks into a focused sound beam.

The large complex brains of the dolphins help them perform various functions which are usually not seen in other animals. As;

Bottle-nose dolphins "socialize" in a manner similar to humans when they band together to hunt. A bottle-nose dolphin from the group begins to create a mud ring around a school of fish by pounding its tail and stirring up the seafloor. The fish shoal is then caught by gradually making the ring smaller. Another bottle-nose dolphin in the group now signals for the other dolphins to form a circle and surround it. In order to escape, the trapped and bewildered fishes jump out of the mud ring. The dolphins eventually swallow them.

They can even "echo-locate," which helps improve their navigation, particularly in murky water. Dolphins use high frequency sound waves that move through water to echo-locate. echoes that are reflected off of barriers. The dolphins are able to recognize the location, shape, etc. of the barriers when these echoes return to them. As a result, they can travel in murky water and avoid obstacles using this technique.

Dolphins have signature whistles that they use to call each other, and they can communicate with each other by making low frequency sounds.

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