I got a pet pigeon this morning from a bird swap. I let her roam free in this closed off, empty room I had, she did some flying laps then settled down. As I was watching her on her perch, she suddenly shook her head and made some really strange head movements. Then she threw up a few mouths full of whole seeds. I'm a new pigeon owner and I afraid she may be sick. Is this normal for a pigeon? What should I do? Thank you!