Brewer, D., Orenstein, R. & Bonan, A. (2018). Vireos (
Vireonidae). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from
https://www.hbw.com/node/52375 on 19 April 2018).
Vireo olivaceous x V. Gilvus cross, Reno, Nevada
7/16/13. I recently discovered & photographed a mixed pair (V. olivaceus x V. gilvus) with nest & offspring in Reno, Nevada. Follow the link for photos & more details:
http://www.flickr.com/photos/fugl/sets/72157634512200833/comments/