蹼(webbing)是一些半水生四足類動物在前肢或後肢指間長有的皮膜,功能是增加划水時手掌或腳掌的截面積,讓這些動物能更有效率的進行游泳。常見的有蹼動物有水鳥(特別是游禽,包括鴨、鵝、鷗類、企鵝等)、蛙類、水獺、鴨嘴獸等。
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