MacGillivray's warbler

MacGillivray's warbler (Geothlypis tolmiei) is a species of New World warbler. These birds are sluggish and heavy warblers, preferring to spend most of their time on, or near the ground, except when singing.

MacGillivray's warbler was named by John James Audubon in honor of Scottish ornithologist William MacGillivray, although the proper credit to its discovery goes to John Kirk Townsend. The specific name was given in honor of William Fraser Tolmie.

Adult MacGillivray's warblers are an olive-green color on their upperparts and dull yellow below. Males have black heads and breasts, while females and immature birds have drab light gray heads; both males and females have broken white eye-rings. The song is a series of repeated two-note phrases, gradually increasing in volume, ending with two single notes: jeeter jeeter jeeter JEETER JEETER jeet jeet. 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.

Measurements:


 * Length: 3.9 - 5.9 in
 * Weight: 0.3 - 0.5 oz
 * Wingspan: 7.5 in

MacGillivray's warblers are migratory and spend their summers in temperate forests in the western United States, and in boreal forests of west Canada. In autumn, these birds migrate to Central America, where they stay in temperate shrublands for the winter.

Books

 * Miller S, Erickson CW, Taber RD & Nellis CH. (1972). Small Mammal and Bird Populations on Thompson Site Cedar River Parameters for Modeling. In Franklin, Jerry F, L J Dempster and Richard H Waring (Edited by) Research on Coniferous Forest Ecosystems: First Year Progress in the Coniferous Forest Biome, Us Ibp (Int Biome Prog) Proceedings of a Symposium, Bellingham, Washington, March 23-24, 1972 322 P Illus Pacific Northwest Forest and Range Experiment Station, Portland, Oregon 199-207, 1972.
 * Pitocchelli, J. 1995. MacGillivray’s Warbler (Oporornis tolmiei). In The Birds of North America, No. 159 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists’ Union, Washington, D.C.
 * Zinkl JG, Henny CJ & Shea PJ. (1979). Brain Cholin Esterase Activities of Passerine Birds in Forests Sprayed with Cholin Esterase Inhibiting Insecticides. In Nielsen, S W, G Migaki and D G Scarpelli (Ed) Animals as Monitors of Environmental Pollutants; Symposium, Storrs, Conn, USA, 1977 Xii+421p National Academy of Sciences: Washington, DC, USA Illus Maps Paper P356-365, 1979.

Thesis

 * Hagar JC. Ph.D. (2004). Functional relationships among songbirds, arthropods, and understory vegetation in Douglas-fir forests, western Oregon. Oregon State University, United States, Oregon.

Articles
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