I have 12 10 week old chicks(2 barred rocks and 10 silkies) i know for sure I barred rock and 1 silkie (huge walnut comb and waddles and is a bully hackle feathers will puff out )... I have two thet are crowing but they won't let me see them do it... everytime I walk away they crow and they refuse to do it when I am watching... I will assume its the two I know are roos...