Distribution
Bullock's orioles are native to western North America, though according to Jaramillo (1999) they are sometimes found as vagrants in the eastern half of the continent. During the breeding season, they are found as far west as the eastern foothills of the Cascade range. Their breeding range stretches east to the Dakotas, Kansas, and northern central Texas (Jaramillo and Burke 1999). This species can be found as far north as British Columbia in Canada and as far south as Sonora or Durango in Mexico (Jaramillo and Burke 1999; Rising and Williams 1999). It is common throughout its range, but is absent in parts of Arizona and Idaho where a combination of extreme elevation and an arid climate make for poor living conditions (Rising and Williams 1999). During winter, this species retreats to Mexico and northern Central America. Its winter range extends south and east from Sinaloa to Oaxaca (Jaramillo and Burke 1999).
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