What two factors are stated to provide the most reliable method for separating the Hooded Oriole from the Orchard Oriole in the field?

Answer

Color saturation and geographic location

Mastering the male's color saturation (true black vs. purplish-chestnut) and the bird's geographic location provides the most reliable method for identification.

What two factors are stated to provide the most reliable method for separating the Hooded Oriole from the Orchard Oriole in the field?
birdidentificationorioleOrchard Oriolehooded oriole