| 11. | Like most parrot species, budgerigar plumage fluoresces under ultraviolet light.
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| 12. | It has four or five body moults before reaching adult plumage.
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| 13. | There is considerable variation in the plumage exhibited by the family.
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| 14. | The rest of the plumage on the bird is mostly blue.
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| 15. | The populations vary in plumage and several are named as subspecies.
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| 16. | After the first winter, the young moult into adult plumage.
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| 17. | The drabber winter plumage is basically brown above and white below.
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| 18. | In other plumages, the yellow may be diluted by white.
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| 19. | It is virtually identical in plumage to the smaller downy woodpecker.
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| 20. | Their soft plumage is cryptically colored to resemble bark or leaves.
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