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able albino appearance aviary beak become bird's birdroom bred breeders breeding cage budgies canary seed cats cere characteristic chicks chlamydiosis Choose chromosomes cinnamon cock claws clean cobalt cock bird colour varieties concave containers cover crested budgerigars Cuttlefish dark factor dark green Dominant gene dominant pied door droppings easily eggs ensure entrance hole exhibition budgerigars eyes feather-plucking feeding flight feathers floor French moult front genes genetic greenfood grey greywing hatching homozygous individual keep Lacewing light green sf light yellow lutino markings mating melanin millet moult mutation nest nestbox normal offspring opaline pair perches plastic plumage plywood possible prevent recessive gene relatively remove ring rodents safety porch sex chromosomes sex-linked shelter sick budgerigar sides sky blue spangle light green styptic pencil tend throat spots usually wing wire mesh wooden yellow-faced yellow-wing young bird young budgerigars