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Them getting a big crop is nothing to worry about. It's normal. If it's not ever full it means they're not eating enough. If their crop is filled to the max ( chickens sometimes do this if they've been deprived of food for awhile, then have an all you can eat buffet set in front of them) they will just stand still looking a bit miserable and do this wierd swallowing thing. I'll try and explain it. Say if you had something stuck in your neck and were trying to swallow it down. Oh I'm lousy at expainin things but you'd know it when you see it. But even then it's alright. They just won't have to eat for awhile.