Black-throated Green Warbler Life History

Habitat

Habitat ForestsBoreal coniferous forest and transitional coniferous-deciduous forest.Back to top

Food

Food InsectsInsects and insect larvae.Back to top

Nesting

Nest Placement

Nest Tree

Nest Description

An open cup of twigs, grass, bark, and spider silk, lined with moss, hair, and feathers. Typically located at a fork in tree branches, one to three meters (three to ten feet) from the ground.

Nesting Facts
Clutch Size:3-5 eggs
Egg Description:Whitish with variable brown blotches or speckles.
Condition at Hatching:Helpless with sparse down.
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Behavior

Behavior Foliage GleanerGleans from small branches; sometimes hovers and picks prey from leaves and branches.Back to top

Conservation

Conservation Low ConcernBlack-throated Green Warbler populations appear to have been stable between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 10 million with 71% spending some part of the year in Canada, 29% in the U.S., and 34% in Mexico. They are a U.S.-Canada Stewardship species and rate a 9 out of 20 on the Continental Concern Score. They are not on the 2014 State of the Birds Watch List. Logging of coniferous forests negatively affects Black-throated Green Warbler populations, but the species does also breed in second-growth coniferous forest. Back to top

Credits

Lutmerding, J. A. and A. S. Love. Longevity records of North American birds. Version 2015.2. Patuxent Wildlife Research Center, Bird Banding Laboratory 2015.

Morse, Douglass H. and Alan F. Poole. 2005. Black-throated Green Warbler (Setophaga virens), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

North American Bird Conservation Initiative. 2014. The State of the Birds 2014 Report. US Department of Interior, Washington, DC, USA.

Partners in Flight (2017). Avian Conservation Assessment Database. 2017.

Sauer, J. R., J. E. Hines, J. E. Fallon, K. L. Pardieck, Jr. Ziolkowski, D. J. and W. A. Link. The North American Breeding Bird Survey, results and analysis 1966-2013 (Version 1.30.15). USGS Patuxtent Wildlife Research Center 2014b. Available from http://www.mbr-pwrc.usgs.gov/bbs/.

Sibley, D. A. (2014). The Sibley guide to birds, second edition. Alfred A. Knopf, New York, USA.

Stephenson, T. and S. Whittle (2013). The Warbler Guide. Princeton University Press, New Jersey, USA. 

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