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Merlin Bird ID

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    Black-throated Blue Warbler Life History


    Habitat Forests

    • Breeds in mature deciduous and mixed coniferous-deciduous woodlands with a thick understory, often in hilly or mountainous terrain.
    • Winters in dense tropical forests.
    • On migration, found in variety of habitats, including forest, forest edges, parks, and gardens.
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    Food InsectsInsects and some small fruits.Back to top


    Nest Placement

    Nest Shrub

    Nest Description

    Nest an open cup of strips of bark, held together with spider web and saliva. Places in fork of low shrub.

    Nesting Facts
    Clutch Size:2-5 eggs
    Egg Description:Creamy white with dark speckles concentrated at the large end.
    Condition at Hatching:Helpless with tufts of down.
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    Behavior Foliage GleanerForages mostly in lower to mid-levels of forest, taking insects mostly from the underside of leaves.Back to top


    Conservation Low ConcernBlack-throated Blue Warbler populations are stable and increased between 1966 and 2015, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 2.1 million, with 65% breeding in Canada, 35% spending some part of the year in the U.S., and 2% in Mexico. The species rates a 9 out of 20 on the Continental Concern Score, and is not on the 2016 State of North America's Birds' Watch List. Black-throated Blue Warbler numbers probably decreased markedly with destruction of eastern forests in 17th and 18th centuries, but with the beginning of abandonment of farms in New England in the late 19th and 20th centuries, populations rebounded. Back to top


    Holmes, Richard T., Sara A. Kaiser, Nicholas L. Rodenhouse, T. Scott Sillett, Michael S. Webster, Peter Pyle and Michael A. Patten. 2017. Black-throated Blue Warbler (Setophaga caerulescens), version 3.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

    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.

    Sauer, J. R., D. K. Niven, J. E. Hines, Jr. Ziolkowski, D. J., K. L. Pardieck, J. E. Fallon and W. A. Link. The North American breeding bird survey, results and analysis 1966-2015 (Version 2.07.2017). USGS Patuxent Wildlife Research Center 2017.

    Sibley, David Allen. 2014. The Sibley guide to birds, second edition. Alfred A Knopf, New York.

    Stephenson, Tom and Scott Whittle. 2013. The Warbler Guide: Princeton University Press.

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