|Clutch Size:||3-6 eggs|
|Number of Broods:||1-2 broods|
|Egg Length:||0.7-0.8 in (1.77-2.05 cm)|
|Egg Width:||0.6-0.6 in (1.42-1.55 cm)|
|Incubation Period:||11-13 days|
|Nestling Period:||8-9 days|
Kentucky Warbler declined through much of its range between 1966 and 2014, and overall, numbers were down by about 36% during that time, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 2.8 million, with 100% spending part of the year in the U.S., and 22% in Mexico. The species rates a 14 out of 20 on the Continental Concern Score. Kentucky Warbler is a U.S.-Canada Stewardship species and is on the 2014 State of the Birds Watch List, which lists bird species that are at risk of becoming threatened or endangered without conservation action.Back to top
Lutmerding, J. A. and A. S. Love. (2019). Longevity records of North American birds. Version 1019 Patuxent Wildlife Research Center, Bird Banding Laboratory 2019.
McDonald, Mary Victoria. (2013). Kentucky Warbler (Geothlypis formosa), 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, NY, USA.
Stephenson, T. and S. Whittle (2013). The Warbler Guide. Princeton University Press, New Jersey, USA.