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Toward the end of incubation a developing chick will ‘internal pip’ – this is a very important time. The chick has to push its way through the internal membrane. This is the membrane that separates the developing embryo from the ‘airsac’ end. This normally happens 2 full days before hatch and is extremely demanding on the chick’s energy reserves.After the ‘internal pip’ stage your chick will set about the task of ‘external pip’.
This is when the chick begins the task of pipping around the inside of the shell.