Hi all, this is my first post! We have 6 chickens, 2 barred rock, 2 buff orpingtons, and 2 amerucanas. We got them all on the same day, they are all the same age. They're a/b 20 weeks old now. One of each of the varieties has been laying regularly now for 3 or more weeks. The others of each variety are not. They aren't crowing or acting otherwise roostery. Their combs are less developed than the laying hens, but otherwise, they are similar. Has anyone had this happen? Are they roosters even though there is no crowing? Are there behavioral reasons that the others aren't laying yet? Why is it taking so long for the others to lay if they aren't roosters? Thanks for any help you can provide!