Like other large carnivores, tigers need ample space and prey to thrive: Each animal might eat 50 deer a year.
类似于其他大型食肉动物，老虎的兴盛需要足够的空间和食物：每只老虎一年可能要吃50只鹿。
Antarctica is home to many seal species such as this fur seal. Its large eyes are designed to seek out prey in dim waters and are a slightly different shape to a land mammal's.
南极是许多种海豹的栖息之地，就像这只毛皮海豹，它的大眼睛是用来在黑暗的海水中追寻猎物的，与陆地哺乳动物的眼睛形状稍有不同。
The apparent vulnerability of tigers and polar bears to reductions in the availability of prey may be linked to the energetic costs of being a large carnivore.
老虎或是北极熊的数量与捕食对象息息相关的这种脆弱性来自于维系大型肉食动物所需的能量。
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