But to live here permanently, the marten needs a more reliable food source. 要在这里常住,松貂就需要稳定的食物来源

84. It's spring, the best time of year for a marten to find food.
    春天,是松貂找食的最佳时节
85. Bird's eggs are a seasonal snack and for a short time, there's plenty of them
    鸟卵是季节性的美餐 虽然数量众多,只是不能长时间享受
86. Sometimes perhaps, too many.
    有时候可能是…太多了
87. But to live here permanently, the marten needs a more reliable food source.
    要在这里常住,松貂就需要稳定的食物来源
88. Squirrels fit the bill.
    松鼠就是
89. They thrive here on the pine cones and although these are also seasonal they can be stored and eaten throughout the year.
    松鼠以松果为食, 虽然松果是季节性生长的,但可以贮藏起来吃一整年
90. The squirrels are busy mating
    松鼠忙着交配

来自《行星地球 第一季 第十集 Planet Earth S01E10 季节森林》第 87 行