choking on pellets
I (think/hope) that I've recently been successful in converting my flock from an all seed diet to a pelleted diet. I've been taking the transition slowly as they've only been on it for about five days, allowing them to only have seeds in the evening (as noted in the book "Cockatiels for Dummies") While my birds have taken a liking to the new food, one of them seems to be having an issue with the pellets. I only see, what looks like, him choking when he's eating the pellets.
He never exhibited such a behavior while on the seed diet. I'm concerned about a few things. One, is he having an allergic reaction to the pellets and causing him to choke? Two, is he just not chewing/breaking them apart well enough? In either case, I would appreciate some feedback on a course of action that I need to take for either, or, what to do if there are any other issues that may come to mind.
I'm thinking I can rule out the first one, but not entirely, as his crop is not swollen or enlarged. He's not thin either, which indicates that he's getting the daily nutritional value. I'm just concerned about his overall comfort and if this is a serious issue. Thanks!