Baltimore, Bullock's orioles will retain separate identities

Bird Hybrids: Bullock's Oriole x Baltimore Oriole

What is the State Bird of Maryland? – Nature Blog Network

Genomic and plumage variation across the controversial Baltimore and Bullock's oriole hybrid zone

Revisiting the Baltimore–Bullock's Oriole hybrid zone reveals changing plumage colour in Bullock's Orioles

Bird Hybrids: Bullock's Oriole x Baltimore Oriole

One Species or Two? A Winner Emerges in the Great Oriole Debate

Baltimore Oriole

Baltimore Oriole Our Fine Feathered Friends

Oriole Migration and Annual Cycle, Baltimore Orioles

Are Baltimore Orioles and Bullock's Orioles Different Species?

Environmental News Network - Study: Oriole Hybridization Is a Dead End

Oriole hybridization is a dead end: study

Bird Hybrids: Bullock's Oriole x Baltimore Oriole

Extensive introgressive hybridization within the northern oriole group (Genus Icterus) revealed by three‐species isolation with migration analysis - Jacobsen - 2012 - Ecology and Evolution - Wiley Online Library

May, 2020