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Does your budgie have a mirror? Could it possible be that he's just regurgitating his food to 'feed' the mirror, or even to feed the other bird?
He may also have caught a chill if he's been anywhere near a draft lately. Isolation, warmth and weak chamomile tea, plus a millet spray and possibly some egg food might help in this case.
Is there a distinct fishy smell near your budgies mouth? If so then you need to take him to a vet to possibly get some Metronidazole as treatment for Trichomonas.
Good luck!
Anna
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