I found my hen sitting on the nesting box at 6:30 tonight acting like she was trying to lay an egg. She was pushing with her eyes closed. I decided to leave her to do her thing and went back out at 8:45 to collect the egg. There was no egg. She was walking around on the floor of the coop but her butt/tail was dipping, if you will, up and down. I watched the other hens and they were not doing that. They all jumped up on the roost, her included, to settle in for the night. I observed her breathing heavily with her tail dipping. It seemed like she was trying to push, as well. She the put her head back between her wings and sat there. Do you think she might be egg bound? My hen laid an egg. All is well.