My newly adopted Grey seems to always "chew the cud" so to speak. Sometimes after eating he will mess with regurge/fluid in his beak for a long time. He does not do this everytime he eats, just often. I've included a link to the video, I'm not sure how else to share a video clip so it's a YouTube link. I hope that's ok, I'm curious if it's hormonal related? Bordem?