Canada Warbler Life History


Nest Placement

Nest Ground

Nesting Facts
Clutch Size:2-6 eggs
Number of Broods:1 brood
Egg Length:0.6-0.8 in (1.6-1.9 cm)
Egg Width:0.5-0.6 in (1.2-1.4 cm)
Incubation Period:11-12 days
Nestling Period:8 days
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Behavior Foliage GleanerBack to top


Conservation DecliningCanada Warbler populations declined by over 2% per year between 1966 and 2015, resulting in a cumulative decline of 65%, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 4 million, with 82% breeding in Canada, and 18% in the U.S. The species rates a 14 out of 20 on the Continental Concern Score. It is a Tri-National Concern species, and a U.S.-Canada-Stewardship species. Canada Warbler is on the 2016 State of North America's Birds' Watch List, which includes bird species that are most at risk of extinction without significant conservation actions to reverse declines and reduce threats.Back to top


Dunne, P. (2006). Pete Dunne's essential field guide companion. Houghton Mifflin Harcourt, New York, USA.

Lutmerding, J. A. and A. S. Love (2016). Longevity records of North American birds. Version 2016.1. Patuxent Wildlife Research Center, Bird Banding Laboratory, Laurel, MD, USA.

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

Pieplow, N. (2017). Peterson field guide to bird sounds of eastern North America. Houghton Mifflin Harcourt Publishing Company, NY, USA.

Reitsma, Len, Marissa Goodnow, Michael T. Hallworth and Courtney J. Conway. 2009. Canada Warbler (Cardellina canadensis), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

Sauer, J. R., D. K. Niven, J. E. Hines, D. J. Ziolkowski, Jr., K. L. Pardieck, J. E. Fallon, and W. A. Link (2017). The North American Breeding Bird Survey, Results and Analysis 1966–2015. Version 2.07.2017. USGS Patuxent Wildlife Research Center, Laurel, MD, USA.

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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