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GAP Analysis Predicted Distribution Map

Cassin's (Solitary) Vireo (Vireo solitarius)

Species Code: VISO

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

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

This species is fairly common in eastern Washington in dry forests of low and moderate elevations. In western Washington, it is uncommon to common in the Puget Trough, along river valleys in the Casccades, dry forests of the north-eastern Olympics, pine forest in prairie zones, and dry forests of the San Juan Islands. It is absent from the western Olympic Peninsula and outer coast.

Good habitat in core zones included all forests in eastern Washington below the Subalpine Fir zone. In western Washington, forests below the Silver Fir zone were also included. It is excluded from the western Olympic Peninsula and outer coast by range limits.

The Cassin's Vireo is characteristic of dry coniferous forests in Washington, though is has been suggested that it prefers to place its nest in a hardwood tree. This species is reported as common through the San Juan Islands, an area drier than most of western Washingtn. Over most of the Olympic Peninsula’s wet forest they are rare., but they thrive in the rain-shadowed forests of the northeastern Olympic Peninsula. In eastern Washington, this species can be found at low and moderate elevations in conifer forests throughout the region. In the dry Blue Mountains, Cassin's Vireos are often noted as high as 4000 feet.

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