Dolphins are very smart and playful animals. Although they live in the water, dolphins are mammals just like humans and need air to breathe, which they do out of a blowhole on the top of their heads. In fact, dolphins can only stay underwater for 15 minutes at a time.
Dolphins have anywhere from eight to 250 teeth, depending on the type of dolphin they are. They don't use their teeth to chew food but rather for catching it. Dolphins are carnivores, which means that they eat meat. The most common and well-known type of dolphin is the bottlenose. Despite their name, killer whales, or orcas, are actually the largest type of dolphin. Dolphins are one of the most intelligent animals and can be trained by humans. Dolphins have a special way of communicating with each other by using clicking and whistling sounds. They are social animals that live in groups of 10 to 12. Male dolphins are called bulls, females are called cows and babies are called calves. Since dolphins are mammals, they give birth to live babies and produce milk for them. Just like land mammals, dolphin calves have hair on their bodies for the first two weeks of their lives.