Differences Between Baltimore and Orchard Orioles: An Identification Primer - Avian Report
How 'Bout Them O's? – Cromwell Valley Park Council
Bullock's oriole - Wikipedia
NestWatch Five Nests To Find This Year - NestWatch
orchard oriole — Bird News — The Wood Thrush Shop
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Nests Aren't Just for Birds - Newport This Week
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Identification - Orchard Oriole - Icterus spurius - Birds of the World
Audubon's Oriole Identification, All About Birds, Cornell Lab of Ornithology