Both of my hens crow. When my roo died last year, my dominant hen crowed a LOT...but I think it was an "I'm lonely, is anyone out there?" kind of crow. I had lost nearly all of my flock to illness, and when the roo died, she was all that was left in the coop. I had 2 in a separate pen. They started "crowing" to each other once they discovered there were "others". Once I put them all together in the spring, they quit crowing. They ALL lay eggs and are very henlike, except for the occassional crowing. NOW, I had to separate my Mille Fleur D'Uccle because she was pecked. She is in the house. She crows and so does the dominant hen in the coop outside. I think they are mourning. They let out this sorrowful, horrific crow as if they are crying out to the world, "Is another chicken out there somewhere?". Is is sad and embarrassing at the same time. They are both laying eggs currently (middle of winter)....so I don't think they are going through a sex change! It is just plain WIERD!