I have 5 hens, 2 are 7 months old (a Barred Rock and Rhode Island Red) and I raised by hand, picking them up a lot and holding them in my lap. When I am in the yard now with my kids and sitting down, both of the younger hens will come up and peck me lightly, but continuously on the back. It doesn't matter what clothes I am wearing. They don't peck my kids- who both spend a lot of time with them, hugging on them. Sometimes if I am crouched over, they jump up on my back. It seems they want attention? I sometimes then pick them up and hold them. When I put them back down they will start again. It's annoying. How can I get them to stop this behavior?