The males are more brightly colored, slightly larger and heavier too.Their tail is long, square, and jet black. All exposed skin is black. All males have contrasting orange and black plumage, a black throat patch and a white wing bar. The underparts, breast, and face are orange or yellow; the back, wings, and tail are black. A black line extends from each eye to the black crown, and flight feathers are tipped orange forming a T shape. Adult females, by contrast, have grey-brown upperparts, duller yellow on the breast and underparts, and an olive crown. They lack the black eye-line.
Habitat and Distribution
Bullock's Orioles are native to western North America. Their breeding range stretches east to the Dakotas, Kansas, and northern central Texas. This species can be found in British Columbia, Canada, Sonora or Durango in Mexico.
These birds forage in trees and shrubs, also making short flights to catch insects. They mainly eat insects, berries, and nectar.
The breeding is from May to July. Mated pairs of Bullock's Orioles, weave deep, pendant baskets in which 3-6 eggs are laid.
Calls and Songs
Both males and females sing. While males have a sweeter voice, females tend to be more prolific singers. This bird's song is similar to that of the Baltimore Oriole, but faster and somewhat more harsh.