Chestnut-sided Warbler Life History


Habitat Open Woodlands

  • Breeds in early successional deciduous woods.
  • Winters in moist tropical forest.
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Food InsectsInsects and other arthropods, occasionally fruit.Back to top


Nest Placement

Nest Shrub

Nest Description

Nest an open cup woven of bark strips, weed stems, grasses, and plant down. Lined with fine grasses, hair or rootlets. Placed in small crotch of shrub or within a group of thin vertical stems, less than 2 m (6.5 ft) from ground.

Nesting Facts
Clutch Size:3-5 eggs
Egg Description:Creamy white or greenish with brown speckles.
Condition at Hatching:Helpless with sparse down.
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Behavior Foliage GleanerGleans insects from the bottom of leaves.Back to top


Conservation Low ConcernChestnut-sided Warbler populations declined by about 44% between 1966 and 2015, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 19 million with 30% breeding and migrating through the U.S., 70% in Canada, and 9% wintering in Mexico. It is a U.S.-Canada Stewardship species, and rates a 12 out of 20 on the Continental Concern Score. Chestnut-sided Warbler is not on the 2016 State of North America's Birds' Watch List. Numbers have declined in part due to loss of habitat.Back to top


Byers, Bruce E., Michael Richardson and Daniel W. Brauning. 2013. Chestnut-sided Warbler (Setophaga pensylvanica), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

Dunn, J. L. and K. L. Garrett. 1997. A Field Guide to the warblers of North America. Boston, MA: Houghton Mifflin Co.

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, 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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