Flippers may indeed be a necessary response to aquatic life, turtles, whales, and dugongs also have them.
鳍状肢可能确实是水生生物的必要反应，海龟、鲸鱼和儒艮也有鳍状肢。
They show us what the intermediates might have been like, on the way to extreme cases such as whales and dugongs.
它们向我们展示了进化过程中半成品的样貌，而完全进化的结果是鲸鱼和儒艮。
However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.
然而，从某种程度上讲，海龟并没有像鲸鱼或儒艮一样完全回到水中生活，因为它们依旧在海滩上产卵。
Dugongs are now protected, but their population status remains precarious.
如今，儒艮已经被保护起来，但是它们的数目情况还是危险。
A family of mammals of order sirenia including dugongs and steller's sea cow.
哺乳动物中海牛目中一科包括儒艮和斯特勒儒艮。
Many are large animals, such as rhinos, tapirs, elephants, dugongs and manatees.
它们中的许多都是大型哺乳动物，比如犀牛、貘、大象、儒艮和海牛。
Some believe that dugongs were the inspiration for ancient seafaring tales of mermaids and sirens.
有些人认为，儒艮是为古代美人鱼和塞任(siren)【1】航海故事的启示。
Possibly the inspiration for mariners' tales of mermaids, dugongs are closely related to elephants.
它可能是水手的美人鱼故事的启示，儒艮与大象是密切相关的。
It has been widely suggested or implied that manatees or dugongs could be behind the myth of the mermaid.
美人鱼之谜背后，有人猜测是海牛，亦有人暗示是懦艮(一种海里的哺乳动物)。
Dugongs are now legally protected throughout their range, but their populations are still in a tenuous state.
儒艮目前在整个范围内受到法律的保护，但其数量仍然处于贫乏的状态中。
Dugongs are related to manatees and are similar in appearance and behavior - though the dugong's tail is fluked like a whale's.
虽然儒艮的尾巴意外地有些像鲸鱼，但却与海牛有关，在外观和行为上也与海牛相似。
Dugongs graze on underwater grasses day and night, rooting for them with their bristled, sensitive snouts and chomping them with their rough lips.
儒艮日日夜夜地吃着水下的草料，它们用多刺和敏感的鼻子来翻找，并用粗糙的嘴唇和牙齿反复不断地咀嚼这些草料。
They provide habitat to a number of emblematic or threatened Marine species such as turtles, whales and dugongs whose population here is the third largest in the world.
泻湖的存在给海洋濒危物种如海龟，鲸鱼等提供了栖息地，生活在这里的海牛数量居于世界第三位。
They provide habitat to a number of emblematic or threatened Marine species such as turtles, whales and dugongs whose population here is the third largest in the world.
泻湖的存在给海洋濒危物种如海龟，鲸鱼等提供了栖息地，生活在这里的海牛数量居于世界第三位。
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