Moustachial stripeA streak extending backwards and downwards from the base of the bill, above the malar region, as seen in the Bearded Tit Panurus biarmicus and the Reed Bunting Emberiza schoeniclus. This feature may also be called a 'whisker'. A similar streak immediately below it is called a 'sub-moustachial stripe', while a still lower one is a 'malar stripe'.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver