By Joe Roller, RMBO Board Director, May 30, 2012

A rare sight greeted 10 of us this morning as we studied the breeding birds at Chatfield State Park near Denver on an outing organized by Wild Birds Unlimited and Rocky Mountain Bird Observatory. Late morning, as we watched a singing male Plumbeous Vireo on and near a nest, Becky Campbell and Nathan McAdam spotted a different vireo high in the trees above the path. We all searched the treetops and had a good look at a Yellow-throated Vireo interacting as a pair with the Plumbeous Vireo, coming right to the nest without being chased away. Excitement filled the air – literally – at seeing vireos of different species paired up at a nest!