- 3.9–5.9 in
- 7.1 in
- 0.4–0.5 oz
- Paruline triste, Fauvette triste (French)
- Verderón llorón (Spanish)
- Both male and female Mourning Warblers pretend to have broken wings to distract predators close to their nest.
- The adult female Mourning Warbler eats the eggshells after the young hatch.
- The oldest recorded Mourning Warbler was a male, and at least 7 years, 1 month old when he was recaptured and rereleased during banding operations in Alberta.
Disturbed second-growth forested areas, with moderately closed canopy and thick understory. In winter, wet lowlands with thick vegetation.
Poorly documented. Insects, insect larvae, and spiders during the breeding season. Insects and fruiting bodies on Cecropia tree leaves in winter.
- Clutch Size
- 2–5 eggs
- Egg Description
- White, speckled with reddish brown and black spots.
- Condition at Hatching
- Helpless with tufts of dark gray down and red mouth.
Open cup of grass, leaves, and bark, lined with roots, fine grasses, and hair. Usually placed on or near ground.
Gleans insects from branches of shrubs, picking prey with bill. Removes wings and legs of prey before consuming it.
Mourning Warbler populations declined by about 43% between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 17 million with 11% spending some part of the year in the U.S., and 89% breeding in Canada. This species winters in Central and South America. Mourning Warbler rates an 11 out of 20 on the Continental Concern Score It is a U.S.-Canada Stewardship species, and is not on the 2014 State of the Birds Watch List. Given their preference for disturbed forests, Mourning Warbler populations may have benefited from various human activities that are detrimental to other birds, such as mining, forest clear-cutting, and road-building.
- Pitocchelli, J. 1993. Mourning Warbler (Oporornis philadelphia). In The Birds of North America, No. 72 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, and The American Ornithologists' Union, Washington, D.C.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- Partners in Flight. 2012. Species assessment database.
- USGS Patuxent Wildlife Research Center. 2015. Longevity records of North American Birds.
- USGS Patuxent Wildlife Research Center. 2014. North American Breeding Bird Survey 1966–2014 Analysis.