I'm not sure how to describe the sort of heaving, rocking motion that began two days ago and keeps getting more pronounced in our baby Barred Rock, so it's hard to search the internet. I took a video and uploaded it to YouTube in the hope that someone here might know what is wrong. (So sorry for the noisy kids in the background.) This is the first time we've tried to raise chickens, and we're getting pretty worried about this one, because this motion you see in this video NEVER seems to stop, even when she's sleeping. I have separated her now, but she has been in a 3 foot long box, with 3 other pullets, each of different breeds, with a heat lamp at one end. Currently the hottest part of the box reads 90 degrees. I don't see any of them gathering frequently in either the hottest or coldest spots. They have chick feed, electrolyte water, wood shavings, a roost, and we clean it out every couple of days. It was actually just her and one other for one week, and she seemed the dominant of the two. Then we introduced two more younger chicks, one of which quickly asserted herself as the new sheriff in town. That's when we first noticed this, like a shiver, which we at the time interpreted as fear. When it continued steadily, we thought this seemed odd, but probably harmless. But in two days, it's gotten a little more pronounced and she's eating, drinking, pooping, and moving less. She seems to have stopped growing. And she's getting pecked half to death. Has anyone seen this kind of chick behavior before? Is she going to make it?