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Chestnut-sided Warbler


IUCN Conservation Status: Least Concern

A common bird of second growth and scrubby forests, the Chestnut-sided Warbler is distinctive in appearance. No other warbler combines a greenish-yellow cap, a white breast, and reddish streaks down the sides.

At a GlanceHelp

Both Sexes
3.9–4.3 in
10–11 cm
7.1–8.3 in
18–21 cm
Other Names
  • Paruline à flancs marron (French)
  • Reinita de costillas castañas (Spanish)

Cool Facts

  • On the wintering grounds in Central America the Chestnut-sided Warbler joins in mixed-species foraging flocks with the resident antwrens and tropical warblers. An individual warbler will return to the same area in subsequent years, joining back up with the same foraging flock it associated with the year before.
  • The Chestnut-sided Warbler sings two basic song types: one is accented at the end (the pleased-to-MEETCHA song), and the other is not. The accented songs are used primarily to attract a female and decrease in frequency once nesting is well under way. The unaccented songs are used mostly in territory defense and aggressive encounters with other males. Some males sing only unaccented songs, and they are less successful at securing mates than males that sing both songs.
  • The oldest recorded Chestnut-sided Warbler was at least 6 years, 11 months old when it was found in Rhode Island in 1980. It had been banded in the same state in 1973.


Open Woodland

  • Breeds in early successional deciduous woods.
  • Winters in moist tropical forest.



Insects and other arthropods, occasionally fruit.


Nesting Facts
Clutch Size
3–5 eggs
Egg Description
Creamy white or greenish with brown speckles.
Condition at Hatching
Helpless with sparse down.
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.

Nest Placement



Foliage Gleaner

Gleans insects from the bottom of leaves.


status via IUCN

Least Concern

Chestnut-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.


Range Map Help

Chestnut-sided Warbler Range Map
View dynamic map of eBird sightings

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eBird Occurrence Maps, Chestnut-sided Warbler



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