Tame birds, when approached, will stretch out their necks and ruffle their neck feathering.

驯化的鸟在人靠近时会伸长脖子，竖起脖子上的羽毛。

《柯林斯英汉双解大词典》

My mother feeds scores of tame birds.

我母亲饲养了几十只家禽。

youdao

The birds in the park are quite tame and will take food from your hand.

公园的鸟很温顺，它们会吃你亲手喂给它们的食物。

youdao

Look, even the birds down there look tame, it's incredible.

CNN: Interview with Gordon Liu