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It seems fairly clear from what I've been reading that the feathery halo around
most of the birds in Liaoning is an artifact of preservation, and not evidence
of very fluffy birds. Does this reasoning extend to Changchengornis, though?
Skeletal reconstructions show a large 'crest' almost as thick as the head. Is
there any way to tell whether this crest was actually erect? If this structure
was not a crest, then why is the down on the head so much more extensive than
that along the neck and on the rest of the body?