Oh my goodness...don't tell me that!! I see me buying eggs from you in the future.
well, you learn something new everyday! i had no idea it was co2 accumulation that caused neck spasms and that's what gave the chicks the power to break through! that will be a useful piece of information in the future, and makes me question my choice a lot more.
the hole is small-- about the size of 2 paperclips put together? like, if you straightened one out, bent it in half and poked a hole with those two rods together, about that big. it didn't even put a crack into the egg anywhere. the first one has been internally pipped since last night, so about 23 hours. the second i am not sure. last night it look like it had either gotten into the air cell or was very nearly about to.
there is only a sliver of membrane, but looks exactly how it should for an external pip. nice tissue paper white.
my understanding is that if they have oxygen, even if the air cell got too big and they are squished, they wont die in there just from being too tight, right? as long as the membrane stays pliable? i have no problem leaving the chicks alone as long as the membrane looks white and i can hear chirping.