I have a two month old runt rooster that was separated from his other siblings when they were about three weeks old. He was getting run over a lot, so he has been by himself since then. When we first pulled him out of the lot, he was hunkered down like he was in pain, but he has never been sore to the touch. He eats great and drinks fine too. He is a happy example of what a little roo should be. The only problem is that his tail constantly pulsates. I'm not really sure how to explain this other than that it looks like he has shivers in his back butt area. He walks fine, is outgoing, and plays a ton, so I don't think it is affecting him to much, but I would like to know what could be the cause of this. I know my description lacks details, but I can gladly record a video of it so that you can better see the problem if need be. I am just not sure how to upload a video onto this forum. Thanks in advance.