Wing barA line across the wing contrasting in colour with the rest of it. A long and fairly wide wing bar, such as that of thte Black-tailed Godwit Limosa limosa, may be called a 'wing stripe'. Wing bars and stripes are important identification features in many species, for example in some types of wader.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver