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Put fliers (preferably with picture) in all pet shops in your area
Talk to pet shop personnel
Put fliers (preferably with picture) in all Vet waiting rooms in your area
Talk to Vet and personnel
Put fliers on poles, etc. in surrounding area
Put ad in classified section of newspaper
Talk to mail carriers in your area, newspaper delivery people, meter readers, dog walkers, gardeners, etc.
Set the bird's cage outside, with the door open, complete with fresh food and water. The cage is often a sense of security that the bird is seeking