Sam fell off his cage this morning. About an hour later, I noticed blood in his cage and some on the floor. It is not in his poop, and he is acting normally. Also, it is now gone. Our vet opens in 30 minutes, so I will call him as soon as I can. I think he may have broken a feather when he fell, because he has many pin feathers and other growing feathers in his tail area. Any thoughts?