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There are two sorts of animals called "Dolphins", one is a fish, the common dolphinfish or mahi-mahi is a surface-dwelling ray-finned fish found worldwide in off-shore temperate, tropical and subtropical waters.

The other is an aquatic mammal which, while breathing air, lives its whole life in water. Most species are marine, but there are also fresh water dolphins. Dolphins use echo locating sonar to navigate and catch their food and have special structures in their head and jaws to enable this.

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8y ago

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