Well, they do seem to be able get in somehow. Shame about the chicks. Are you going to get some more?
It’s going to be quite awhile before I try hatching any more.
So far, 3 attempts have cost $80 for the incubator & automatic egg turner; 5 dozen of our fertile eggs; 9 or 10 weeks of 24 hour power to the incubator & turner, and more to the brooder lamp, for a grand total of 3 live chicks...plus, I got to clean and disinfect snake blood stains on the utility room floor.
I can buy live chicks one heck of a lot cheaper, and have rarely lost any once they’ve arrived.