need only about a tenth of the food a carnivorous mammal would. 肉食性哺乳动物十分之一的食物量

56. It might seem there wouldn't be enough food
    这么小的岛屿似乎不可能
57. to support such giants on this relatively small island.
    为这种庞然大物提供充足的食物来源
58. But reptiles, being cold-blooded,
    但冷血爬行动物只需要
59. need only about a tenth of the food a carnivorous mammal would.
    肉食性哺乳动物十分之一的食物量
60. A single meal will last a dragon a month.
    巨蜥一餐可以支撑一个月
61. They're so successful, that their only serious competition
    他们的生存之道如此成功 以至于唯一的
62. comes from others of their own kind,
    天敌就是他们的同类

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 59 行