I have a mystery chick and am hoping someone can identify. I got 18 Cornish X chicks from Tractor Supply last weekend. The other day, I found a chick outside the brooder, wandering the yard. I put it back in the broader, figuring one of the chicks Houdini-ed it's way out. The only thing is...it looks totally different and now there are 19 chicks total. Smaller, fully feathered, seems older? What kind of bird is this mystery chick? Mystery chick photos with the others for comparison below.