birthmark

One of my newly hatched ducklings has an unusual mark on its beak, could anyone twll me if it's just a simple birth mark, or more??

Several months ago I raised a Pekin duckling in my room. He's grown relatively normally (other than the fact that he is freakishly large,) but as soon as his feathers started coming in, I noticed a very strange group of feathers. On the top of his tail, there was a compact group of soft...