My quail are doing this as well! Not to the extend of the above, but I've been a bit worried. They have recently (upon purchase 2 days ago) been moved from a tony bird cage to a large chicken coop. They are feeding on layermash, shell grit, cracked corn and bugs etc. I will have a look for some 'game bird feed' for them at the local produce store. I don't think they sell it though as every time I've asked about food so far I've been told to feed them bird feed. It's only happening with my large Jap quail though (I think F&F?), not my tiny King quail (M&F).