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GAP Analysis Predicted Distribution Map

Northern (Bullock's) Oriole (Icterus galbula)

Species Code: ICGA

Click to enlarge Range map

= Core Habitat
= Marginal Habitat

Breeding Range Map
The green area shows the predicted habitats for breeding only. The habitats were identified using 1991 satellite imagery, Breeding Bird Atlas (BBA), other datasets and experts throughout the state, as part of the Washington Gap Analysis Project. Habitats used during non-breeding months and migratory rest-stops were not mapped.

Metadata (Data about data or how the map was made)

Click to enlarge distribution map

Map with Breeding Bird Atlas records

Other maps & Information:
  • Breeding Bird Atlas
  • NatureMapping observations
    during breeding season
  • NatureMapping observations
    throughout the year

Bullock's Orioles are fairly common in lowland hardwood forests, wetlands, irrigated farmlands, orchards, and suburban areas of both eastern and western Washington. They are most common in lowland riparian habitats east of the Cascades and are absent from the outer coast.

Core areas were those below Interior Douglas-fir (east side) and Western Hemlock (west side) zones, but excluding the Sitka Spruce zone. Good habitats were low-density development, orchards, fresh water/wetlands (except those dominated by conifers in peripheral zones), and hardwood forests. Pastures or mix of agricultural types were adequate, but all non-irrigated agriculture on the east side was excluded.

This species was recently split from other North American forms. Formerly a rare breeder on the west side, Bullock's Oriole numbers have increased with the availability of ornamental trees in residential areas, and with the regrowth of hardwood trees from formerly conifer-dominated areas. Bullock's Orioles are also found in riparian corridors along major rivers. East of the crest, they are most common along rivers, in orchards, and irrigated pastures along rivers. They will occasionally nest around farmhouses or in trees next to stock watering tanks in non-irrigated areas.

Translated from the Washington Gap Analysis Bird Volume by Uchenna Bright
Text edited by Gussie Litwer
Webpage designed by Dave Lester