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www.reference.com/article/dolphins-9d14993634a6bbe

Dolphins are mammals found in the sea and are part of the toothed whale family. They are grey with backs that are darker than the rest of their bodies.

www.reference.com/article/baby-dolphins-3f213de7b7d584f

Baby dolphins, or calves, are born after gestation periods of up to 12 months in the mother's womb. Calves begin swimming in the mother's womb as early as 9 weeks into the pregnancy. When baby dolphins are born, they come out of the mother's womb tail first and immediat...

www.reference.com/article/dolphins-kids-335504668456975

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.

www.reference.com/article/dolphin-information-kids-7b84e543f2a3ce51

Some interesting facts about dolphins are that they belong to the order Cetacea, are mammals that can live in either saltwater or freshwater environments, depending on the species, and have very good hearing and vision. Dolphins are intelligent creatures that also use e...

www.reference.com/article/dolphins-live-5521b18ce751e891

Dolphins are equipped with blowholes on the crowns of their heads through which they breathe air when they reach the surface of the water. They are capable of holding their breath for up to 10 minutes.

www.reference.com/article/interesting-dolphins-kids-299f58208a0e307c

One interesting fact about dolphins is that they use many unique ways to communicate with one another. They also use high-frequency clicking sounds to investigate their surroundings.

www.reference.com/article/eats-dolphins-9a64dcce0785afbc

Sharks, killer whales and humans are the primary eaters of dolphins. Dolphins are near the top of the food chain and employ many defensive strategies, so they are not often eaten by predators.