Connecticut Warbler Life History


Habitat ForestsSpruce and tamarack bogs, less frequently open poplar woodland, in migration and winter in a variety of forest, woodland, scrub and thicket habitats.Back to top


Food InsectsSpiders, insects, and some fruit.Back to top


Nest Placement

Nest Ground

Nest Description

Open cup of fine, dry grasses, dry leaves, stalks of weeds, sedge stems, rootlets, or other plant fibers. Hidden on or near ground, in thick undergrowth of saplings, among thickets or at base of a shrub.

Nesting Facts
Clutch Size:3-5 eggs
Egg Description:Creamy white with dark speckles.
Condition at Hatching:Helpless.
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Behavior Ground ForagerFeeds at or just above ground level.Back to top


Conservation DecliningConnecticut Warbler is uncommon, and populations declined by about 2% per year between 1966 and 2015, resulting in a cumulative decline of 62%, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 1.7 million, with 95% breeding in Canada, and 5% in the U.S. The species rates a 13 out of 20 on the Continental Concern Score. Connecticut 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. Connecticut Warbler is also U.S.-Canada Stewardship species. Back to top


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

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

Pitocchelli, Jay, Julie Jones, David Jones and Julie Bouchie. 2012. Connecticut Warbler (Oporornis agilis), 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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