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Fault bar

A narrow band across the web of a feather, perhaps representing that part of the feather which grew during the later part of a night, hence the alternative terms 'starvation mark' and 'hunger trace'. Each feather so affected has a series of fault bars and they are probably present on most individuals.

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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver


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