A cracked egg under a broody hen that has had a few days to "cook" is one of the foulest odors EVER! Now it was cracked, but not leaking so I decided (brilliant, I tell ya , brilliant) to crack it open and see what was going on. All I can say is, that the yellow goo that came out, and the STANK, is something I won't soon forget. I am sooooo glad it didn't explode in the nest. Note to self- check eggs more frequently.