The mother is still waiting. 母亲依然在等待

303. It's true that there can be safety in numbers,,
     巨大的种群数量确实能保证安全
304. but numbers can also be something of a problem
     但当你试图寻找自己的巢穴之时
305. when you're trying to find your own nest.
     这也会成为问题
306. The mother is still waiting.
     母亲依然在等待
307. Her chicks are now desperate.
     小鸟们快要绝望了
308. In the midst of all this deafening chorus,
     在这震耳欲聋的叫声之中
309. he can recognise her particular cry.
     他可以辨识出对方特有的声音

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 306 行