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http://www.dolphinkind.com/dolphin_facts.html

Facts about Dolphins

Although dolphins live in water, they are mammals and breathe air through their blowhole at the top of their head. Some dolphins can hold up their breath for up to thirty minutes! Dolphins live in groups called Pods. They are very playful and extremely intelligent. When dolphins sleep they keep one eye open at all times. Male dolphins are called Bulls. Female dolphins are called Cows. A baby dolphin is called a calf. Dolphins eat fish and squid.