I didn't say they are a recent development I said they are an aspect what I consider the full development, ie the most complex true expression of the type. The crest and beak crest are sometimes seen with them; these are not speci.fically neccessarily what I mean by plant features. The "fully develooped cockatoo" that I think is actually a plant/blended of plant features is the type where the cross-section is round, the butt is flatt with a keel, and viewed from the rear (not the top) closely resembles the flared bolster on a sikkin. Which type to me resembles a true cockatoo as seen here little or not at all.
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