雀形目小鸟在营巢和哺育幼雏时经常受到天敌和不良气候的危害.有些种类的鸟在失去自己的幼雏后就去哺育其它鸟的幼雏.在克德罗威自然保护区,我们看到一对山雀和非亲生的一窝小山雀.幼雏已经喂大,它们与新双亲一起外出觅食,一起回巢.有一窝蝗莺(Locustella certhiola)既有自己的双亲,又有一对黑 Passerine birds are often endangered by natural enemies and bad weather when nesting and nursling young birds, and some species of birds feed the young birds of other birds after losing their young, , We see a pair of tits and non-native litters.The chicks have been fed large and they go out for food with their new parents and return to the nest together.Local Locusta certhiola has both parents and There is a pair of black