Hi! I am a first time chicken owner. I have 3 chickens that I bought that are already laying and were previously housed together. Today, I noticed that 2 of them were in the coop at about 12. I looked out at 1:30 and they were both still in there so I went to check on them. When I looked in both were panting, one was in the nesting box and the other was trying to climb on her and get into the nesting box with her. I shooed the hen who was climbing on her out of the coop and within a minute she layed her egg. What would cause the other chicken to do this? She doesn't normally go into the nesting boxes except to lay. It worries me especially because I work during the week and it makes me nervous that she has riled them up enough that they were panting. The coop is under a tree with plenty of shade so I know it wasn't from them being too warm. Any help would be appreciated! Thanks!