At the ted talk the person was saying about the mean chickens would lay the most eggs because the chicken would break the eggs of others so the mean one would have the most. But sometimes the “good” chickens would team up and kill the mean one. The chickens are like us when we see something really bad happening we want to run but if its mild like a heist we would want to help and five out the invaders. Same as chickens if their is only one bad chicken they can kill it but if the bad chickens team the “good” chickens could only watch.
Chickens are almost they same as us because we all have the sense to run if something gets too bad.
I watch this farming Youtube video and I saw that he had a mean chicken because one day when he walked to get eggs a few eggs were broken. He thought that it was one chicken doing it so he but the chicken he thought broke his eggs to a different coop kinda like isloation. Then when the main chicken coop still had broken eggs he did this a lot of times before he found out who did it and gave him to a friend as a joke.