I've recently started keeping some silkies, the first chickens I've ever kept (although my grandpa has always kept various ones over the years). I bred three chicks, from a cockerel I had bought, I hatched them in an incubator and hand raised these. They have always been tame, letting me stroke them and pick them up with minimum fuss, and when they grew up I put them in an outdoor run opposite another run with five other silkies in (I couldn't put them together because they all fought. Two of the three were cockerels, so I got rid of one of them, wanting to keep the other to breed. The one I kept was crowing at all hours, from 5am to later in the afternoon, so I was forced to take him to my grandparents house. We put him in an inside run (that was all he had at the time) with a different silkie hen and they got along fine after a bit of fuss. Anytime I go in the shed now, however, he goes crazy, puffing up his chest, running up and down the run and lowering his wing when he does so, like they do when they tread a hen. When I put my hand in the run to get some eggs out, he charged and pecked my hand, drawing blood, as he has also done with my grandpa. I'm wondering if anyone knows why he is acting this way, if it is normal behaviour or if anything can be done to stop it? He hatched at the end of August, so is about 5 months old now.