海豚 - Dolphin ^_^- Dolphins belong to the order of whales.All dolphins, porpoises, and whales belong to the order Cetacea. They are often called cetaceans. Scientists group most dolphins (31 species) in the family Delphinidae, part of the suborder Odontoceti, or toothed whales. Delphinids include such well known dolphins as bottlenose dolphins and common dolphins as well as killer whales and pilot whales.Another cetacean family, Plantanistidae, contains the river dolphins: small-eyed, long-snouted dolphins that live in fresh water. Porpoises belong to their own family, Phocoenidae. Porpoises are different than dolphins. They have shorter snouts, trangular tops fin, and spade-shped teeth. This fact sheet focuses on dolphins in the family Delphinidae- Dolphins live in all oceans.Dolphins live in all oceans of the world. While some inhabit one particular geographical area of an ocean, others like killer whales are found worldwide. Coastal, or inshore, dolphins live close to land and are often seen by people on beaches and boats. Oceanic, or offshore, dolphins live farther out at sea. Many dolphins have a homerange, an area where they tend to stay.
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