We have the various breeds listed below. Two of the silkies are roos and one of the white crested polish is suspect. The two silkie roos now spend their morning grabbing the necks of the hens. It is almost like a tag team effort. No dancing, just attack, grab and pull feathers. The hens scream and run. Two of the orpingtons hide on their roost. Is this normal roo behavior? What is next in the progression of roo behavior? The roo who started to crow first used to dance but now that the second roo crows the dancing has stopped and now the grab thing.