Any of various herbivorous aquatic mammals of the genus Trichechus, having paddlelike front flippers and a horizontally flattened tail and found in warm coastal waters of Florida, northern South America, West Africa, and the Caribbean.

• 海牛一种海牛属食草性水生哺乳动物，长有蹼状前鳍，居中扁平的尾巴，产于美国佛罗里达州、南美洲北部、西非和加勒比海地区海岸温暖的水域中