I recently bought a group of 6 keets last week. When got home I noticed one of them had no tail feathers, and it looked like it's little vent was a little swollen or protruded. I didn't think anything of bc I thought it just looked funny bc it had no feathers back there. Well, I noticed today that that same little keet has been leaning up against the heater and not playing with the others. I also noticed that it's not gotten much bigger, in fact, compared to the others, probably none at all. When I went to pick it up, it peeped like crazy to get down, so when I put it down, it stumbled around, almost like it was drunk. Is there something wrong this little baby, and if so, what can I do for it?