《英语动物关键期.ppt》由会员分享，可在线阅读，更多相关《英语动物关键期.ppt（8页珍藏版）》请在三一文库上搜索。
1、The critical period of chick,Lovely chick,Chickens most important skill is capturing food, no matter males and females. And for the chicks who only have born few days ,they need follow their mother to learn how to capture food. So first they must to know who is their mother and run after the hen.,“,
2、“Chase the hen ”(追赶母鸡）,There is a critical period for chicks to learn this skill . The critical period is about fourth day to eighth day after the chicks have born .They can identify who is their mother and chase the hen to learn other skills through this days.,Some scientists experiment :,When the hen gave birth to chicks , scientists keep the chicks apart from their mother for about 8 days. Then the chicks cant distinguish who is their mother. So they lost the skill of Chase the hen .,The critical period is very important,