Help! Why is this happening? My chicks are 11 days old and just now, two of them only have reverse gear. The two chicks are walking and running only in backwards gear and seem unable to walk forwards. They seem a bit distressed. Can anyone tell me why this is happening? I took them out of their brooder and they seemed to recover a bit. Then I spotted another doing the same. What is going on? They are just started jumping and flying and I can only think they have knocked their heads on the brooder box lid, which is plastic. Has anyone any experience of this. I've never seen this before.