Are relatives a dolphin and a whale?

Dolphin is a small whale. About 37 species of dolphins, almost all live in the seas and only 5 rivers. The largest of the dolphins is the killer whale. It grows to 9.4 m in length. The dolphins have a torso of streamlined shape, sharpened face and sharp teeth. They swim quickly, hunting for fish and squid. Dolphins easily trace spoils by catching ultrasound. Reliable echolocators report to the dolphins about the size of the spoilage and the direction of its movement.

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