I have 11 Plymouth rock hens and they all have their own personalities and some are more intelligent than others. They are excellent layers who provided my family with enough eggs that we could sell a dozen or two a week to another family. At first, one was aggressive when she was in the nest box, but I discovered she could be bribed with kale stems. I haven't had any bitten fingers since. When outside the nestbox the only times me or my brothers have been bit is when hand-feeding them and they miss the food. Overall, they are docile yet very motivated by food. Some of them have even learned to jump up 3 feet onto my arm to be hand fed.