I just got two silkies. I am guessing they are between 8-10 weeks old. One I believe is a roo and the other a hen. Anyway, I have had them for 3 days now and the roo started doing this strange bobbing head thing today. He didn't do it at all before and I noticed it this morning. He looks as though he is trying to swallow something. He doesn't do it all of the time, but goes in spells where his head just keeps bobbing. At first he was eating grass, and I thought maybe he wasn't used to grass and couldn't swallow it right but he keeps doing it. I hope he is okay, he is a beauty. Any ideas as to what it could be. Are there any diseases associated with head bobbing??