Warbler hybrid matched trait diagram (IMAGE) Penn State Caption Golden-wing warbler, blue-wing warblers, and the hybrids that result when individuals of the two species breed, typically have matched face and throat traits; they have both a black face mask and black throat patch or neither black trait. However, an extremely rare hybrid (right) carries the black face mask but not the throat patch. Credit Illustrations: Liz Clayton Fuller; Photo: David Toews Usage Restrictions Credit must be provided License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.