Pip to zip

[Crazychickengirl2]

So I know that birds first pip then after awhile they zip. But why can't they just go straight to zip? What takes them so long?

 

[Chickens are awsome]

they finish absorbing the yolk

 

[Crazychickengirl2]

they finish absorbing the yolk

But why do they make a hole before the yolks not even absorbed?

 

[Chickens are awsome]

But why do they make a hole before the yolks not even absorbed?

So they can breathe after using up all the Aircell. otherwise, they would suffocate.