And Youのインスタグラム(dolphinsandyou) - 3月11日 04時13分

A dolphin's dorsal fin (the fin on its back) has several functions ?.
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It works like a sail to keep the dolphin upright, preventing it from rolling. It also helps to regulate a dolphin's body temperature. On top of that, it helps scientists identify who's who, since each dorsal fin is unique.
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