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Here is an animal that has all kinds of signals of being a juvenile, outside its bones, inside its bones, in its joints, and it has long, isolated plumes extending from its already-very-long tail. This is quite different from living birds and tells us that these decorative feathers preceded adulthood in dinosaurs. Of course, perhaps they're using these feathers in a very different way from living birds, too.
Living birds shoot up to adult size very quickly, mainly as a way of getting strong enough to fly as soon as they can. But they may delay getting their adult feathers for a long time. Gulls, for example, don't look like adults for three or four years even though they learn to fly in only three months.
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