I wish I could get a video, but I've only seen this happen 3 times with this one particular hen, my yellow EE hen Polly. Here's my best attempt at describing it: It seems like another hen bothers her and then she sticks her head out and rubs it on the ground, walking backwards quickly while she's doing it. It looks like she's got a stick lodged in her throat and she's trying to scrape it out. She does this a couple times. But, then she stops and walks around as if it never happened. Has anyone seen anything like this???