However, there is a lot more to a dolphin than just fun and games. They lead complicated lives under the surface of the ocean, fighting for survival. Each and every day is a challenge for this sea-faring creature. Unlike popular belief, dolphins are not fish. In reality, they are actually mammals, like your dog, your cat, and you.
Dolphins have lungs, just like the land mammals, which they use to breath air.
However, they do not breath through their noses. Dolphins, along with all the whales and porpoises of the ocean, have blowholes on the backs of their head. When they are in need of oxygen, they come up to the surface, take a big breath, and return to their underwater kingdom. Also unlike fish, dolphins can drown very easily. They don't have gills like fish do.