Does anyone know of any articles or have any comments on carbon dioxide causing the muscle spasms which cause the chick in the egg to pip the membrane & then the shell? I've known about this for several years from back in the 80's when I raised & hatched cockatiels & various other parrots. Also, that carbon dioxide is given off during respiration in humans, etc. It also builds up in an egg. Any articles or comments on how this all works?
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