Scott collaborated with researchers from Cornell, Ohio, and Pennsylvania to investigate a tip from a birder about an odd sighting. Read the full paper here.
https://www.colorado.edu/asmagazine/2018/12/03/declining-warblers-making-best-bad-situation
Graphic shows predicted family tree of warblers leading to the three-species hybrid. Blue-winged, Golden-winged, and Brewster's Warblers by Liz Clayton Fuller; Chestnut-sided Warbler from del Hoyo et al. (2018) Handbook of the Birds of the World Alive; new hybrid by Jillian Ditner. Graphic courtesy of the Cornell Lab of Ornithology.