From John Blakeman:
"It would be well for everyone to ponder what’s now ahead.
With a rounded bill, it would be otherwise very hard for the little eyass to poke any sort of hole through the egg shell. But the slightly pointed egg tooth will allow the weak eyass to accomplish this.
For most of a month, her lungs have been filled with fluids, and she’s been breathing very moderately through simple air diffusion into her body tissues. But in the last week or so, things start drying out inside the egg and slowly her lungs will get filled with the gases in the end of the shell. It’s still 100% humidity in there, and all is well.