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Sail (anatomy) : ウィキペディア英語版 | Sail (anatomy)
A sail is a large, flattish protrusion from the back of an animal colinear with the spine. Many extinct species of amphibians and reptiles have very extended neural spines growing from their back vertebrae. These are thought to have supported a sail. Paleontologists have proposed many ways in which the sail could have functioned in life. ==Function== Many suggestions have been made for the function of the sail. The consensus amongst modern scholars is that, at least for the pelycosaurs, the sail was used for thermoregulation.〔D.R. Khanna, ''Biology of Reptiles'', pp. 59-60, Discovery Publishing House, 2004 ISBN 8171419070.〕
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