Crazychickengirl2
Songster
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?
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They externally pip when they run out of oxygen in the air cell, but are still absorbing the yolk for hours after that. They don't unzip until they've absorbed everything.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?