My 4 day old chick just started pulling his wing (like he would be preening) & crying. I don't know what it is, does anyone else have an idea or ever seen this before? He is a singleton I hatched out of 10. Everything else has seemed very normal with eating & drinking. Food was able to distract him. I felt both wings to see if the one seemed to hurt but no response. I filmed a little of this behavior that just started about two hours ago. Thank you.