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MacGillivray's Warbler

From Opus

Photo © by revs45North Vancouver, BC, Canada, June 2010
Photo © by revs45
North Vancouver, BC, Canada, June 2010
Geothlypis tolmiei

Oporornis tolmiei


[edit] Identification

Photo © by digishooterWofford Heights, California, USA, June 2018
Photo © by digishooter
Wofford Heights, California, USA, June 2018

13 cm; (5.25 ins)

  • Olive-green upperparts
  • Yellow underparts
  • White crescents above and below the eyes
  • Slate-grey hood with black lores
  • Black upper breast
  • Flesh-coloured lower mandible.

Female: similar but paler

  • Winter adult has paler hood and less distinct eye-ring.

First winter birds

  • Similar to adults with olive-grey back and wings, greenish underside and most of the same hood
  • White throat area
  • Thin pale to white supraloral
  • Eye-ring is thin
  • Hood color cleaner grey in male, more olive in female
  • Gradually moults into full adult plumage

[edit] Similar Species

Mourning Warbler lacks the white eye crescents.

Hybrids between the 2 species occur where the range overlaps.

[edit] Distribution

Breeds in the western United States and Canada from southern Northwest Territories south to central California, Utah and Colorado, scattered populations south and east of regular range; wintering on the Pacific slope of Mexico.

[edit] Taxonomy

This is a monotypic species[1].

Subspecies monticola is not recognised by most authorities.

Hybridizes with Mourning Warbler where ranges overlap.
Formerly placed in genus Oporornis.

[edit] Habitat

Coniferous forest edges, burns, dense thickets, and streamside growth.

[edit] Behaviour

[edit] Breeding

May to August at up to 300m in dense understory along forest edges and clearings. The nest is a cup of plant stalks and grasses, lined with rootlets, hair and fine grasses, and concealed low down in a bush. 3-6 eggs are incubated for 11-13 days, young fledge after 8-9 days. Nests are only rarely parasitized by Brown-headed Cowbird.

[edit] Diet

Almost entirely insects and other arthropods, including beetles, caterpillars and leafhoppers. Forages low in dense shrub cover.

[edit] Vocalisation

  • Song: 3-4 tchee notes in one pitch, then 2-3 more warbles teeoo notes at a lower pitch.
  • Call: a hard shik or tsik; flight call is a penetrating tseep

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from
  2. Avibase
  3. Dunn, Jon; Garrett, Kimball. 1997. A Field Guide to Warblers of North America. Boston: Houghton Mifflin Company. ISBN 9780395783214
  4. Handbook of the Birds of the World Alive (retrieved April 2016)
  5. Avibase
  6. Birdforum thread discussing the id of a young MacGillivray's Warbler

[edit] External Links


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