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Recently the Baltimore Oriole was separated from the more western Bullock's Oriole. When trees were planted on the Great Plains, the two forms extended their ranges and met. Despite the differences in their appearance, it was found that they interbred, and that most birds in the central plains were hybrids, so the birds were combined into a single species called the Northern Oriole. Now, it seems that in some places the birds are choosing mates of their own type, and they are considered separate species again.

Baltimore Oriole

Hemispheric weekly distribution data from eBird at the Cornell Lab. Seasonal ranges derived from eBird and data from BirdLife International and Audubon. Learn more

Species Migrations

Hemispheric weekly distribution data from eBird at the Cornell Lab. Seasonal ranges derived from eBird and data from BirdLife International and Audubon.