Her partner, however, is a regular visitor. 伴侣雄鸟定期前往树洞

39. into a predator-proof fortress.
    打造成了一座抵御捕食者的堡垒
40. But it's also...
    但同时
41. ..a prison.
    也是一座监狱
42. Her partner, however, is a regular visitor.
    伴侣雄鸟定期前往树洞
43. For the next two months, he will deliver all her food
    接下来的两个月 雄鸟会将食物
44. directly to her door.
    直接送到树洞口
45. But she can be fussy.
    但雌鸟也会有些挑剔

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 42 行