A general term for toothed whales that belong to the family Pteropidae, a primitive order of cetaceans with long snouts that live in rivers and coastal areas. There are five species in this family: the Ganges river dolphin, the Indus river dolphin, the Amazon river dolphin, the Yangtze river dolphin (baijii), and the La Plata river dolphin. They are found in temperate and tropical regions from India to Southeast Asia and South America. Unlike common dolphins, they travel in parent-child pairs or pairs and do not form large groups. → Dolphins Source : Heibonsha Encyclopedia About MyPedia Information |
河川や沿岸域に生息する吻(ふん)の長い原始的な鯨目カワイルカ科に属するハクジラの総称。この科の仲間には,ガンジスカワイルカ,インダスカワイルカ,アマゾンカワイルカ,ヨウスコウカワイルカ(バイジー),ラプラタカワイルカの5種がある。インド〜東南アジアと南アメリカの温帯,熱帯に分布する。マイルカ類と異なり,親子やつがいで行動し大きな群れはつくらない。→イルカ
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