"Maybe the are arming up for a revolt against the human oppressors."
Man, I hope not! I raise laying hens as an extra income source. My hens are treated better than some children are, so I'm pretty sure they'll only kill me after they've killed off the rest of you, LOL! :)
However, I will check them for teeth later and report back.
Oops! Meant to add that chicken eggs are very useful in research of all kinds. They've used them to study fetal alcohol syndrome and a whole host of other human baby-in-utero related illnesses and defects.
A friend of mine is a Professor at the UW Research labs, and I visit his four huge chicken barns from time to time. He taught me how to hypnotize a chicken, which he does while he's giving some of his lectures. The chicken just lays there at his feet, staring off into space. How much more fun can you have than that? (They'll stay that way for about 30 minutes. They're not real bright...)