Breeding Range: Breeding Range 2: Non Breeding Range: Geothlypis: tolmiei: Oporornis: tolmiei: NA: w, also n Mexico: MA: Oporornis: tolmiei: monticola: Oporornis: tolmiei: tolmiei : Physical charateristics. MacGillivray’s Warbler Seasonal Range Habitat. The CWHR System was developed to support habitat conservation and management, land use planning, impact assessment, education, and research involving terrestrial vertebrates in California. Description: Height measures about 13 cm. The body is olive green on their upper body and yellow below. The MacGillivray's Warbler has a large range, estimated globally at 2,600,000 square kilometers. MacGillivray's is a common western warbler. Inhabits coniferous forest clearcuts with spruce and Douglas-fir or mixed deciduous forests with birch, aspen and poplar during the breeding season. Range: This species is found in the western United States and western Canada. Two similarly hooded warblers occur east of the Rockies, the Connecticut Warbler (Oporornis agilis) and the Mourning Warbler (Oporornis philadelphia). They are heavy bodied with short tails. Habitat characteristics include dense undergrowth of shrubs and moderate cover (Morrison and Meslow 1983). In winter, they migrate south to Central America. The males have a black breast and head. The global population of this bird is estimated at 5,400,000 individuals and does not show signs of decline that would necessitate inclusion on the IUCN Red List. Native to the Americas, this bird prefers forest and shrubland ecosystems. The females have grey heads and white eyerings. Widespread logging in this area has created habitat appropriate for MacGillivray's Warblers, so the information is confusing. MacGillivray's Warblers are common within their range, but have experienced recent declines. Predicted breeding range Learn how the map was created. Title MacGillivray's Warbler Range - CWHR B460 [ds1634] Publication date 2016-02-0100:00:00 Presentation formats digital map FGDC geospatial presentation format vector digital data Other citation details These are the same layers as appear in the CWHR System software. Partial white eye-ring is broken fore i and aft. In Washington, the Breeding Bird Survey has reported a significant, statewide decline in population since 1966. An estimated 8% of the species' North American breeding range lies within the Boreal Forest. MacGillivray's warblers are migratory and spend their summers in temperate forests in the western United States, and in boreal forests of west Canada. Range breeding ... MacGillivray's warblers are very similar to their eastern counterpart, the mourning warbler, the primary difference between the two species being the mourning warbler's lack of an eye-ring. Male: Olive above, yellow below, with a slate gray hood (blackish on the throat) completely encircling the head and neck. = Core Habitat Breeding Range Map The green area shows predicted habitats for breeding only. Vector datasets of CWHR range maps are one component of California Wildlife Habitat Relationships (CWHR), a comprehensive information system and predictive model for Californias wildlife. Listen: Overview .