It's the newly born calves that they are after. 它们的目标就是新生的小鹿

81. Wolves.
    狼
82. Packs of them, eight to ten strong, shadow the migration.
    8～10只狼组成的小股部队 悄悄地尾随着迁徙的大军
83. And they are hungry.
    它们已是饥肠辘辘
84. It's the newly born calves that they are after.
    它们的目标就是新生的小鹿
85. Running directly at the herd is a ploy to generate panic.
    直冲向鹿群是一种制造恐慌的战术
86. The herd breaks up
    鹿群奔散开来
87. and now it's easier to target an individual.
    狼群便更容易锁定单个目标

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 84 行