I got 6 Silkies in March. I moved them all outside a month ago. I have no clue as to who is what, but this morning one crowed for the first time. Hens can crow I read, so I'm still not certain it's a rooster (almost certain though). My question is, there is a lot of belly bumping going on. Do roosters do that to hens? or is it possible I have more roosters?