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Wilson's Warbler

Cardellina pusilla ORDER: PASSERIFORMES FAMILY: PARULIDAE

IUCN Conservation Status: Least Concern

A common warbler of willow thickets in the West and across Canada, the Wilson's Warbler is easily identified by its yellow underparts and black cap.

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At a GlanceHelp

Measurements
Both Sexes
Length
3.9–4.7 in
10–12 cm
Wingspan
5.5–6.7 in
14–17 cm
Weight
0.2–0.4 oz
5–10 g
Other Names
  • Paruline à calotte noire (French)
  • Chipe coronoa negra, Reinita Gorrinegra, Reinita de Wilson, Chipe Careto, Reinita de Capucha, Chipe Coroninegro (Spanish)

Cool Facts

  • The Wilson's Warbler is found in a large diversity of environments in the winter. It is the only migrant warbler regularly found in tropical high plains (paramo).
  • The Wilson's Warbler trends toward brighter, richer coloration from the eastern part of the range to the west. The Pacific coast populations have the brightest yellow, even orangish, foreheads and faces. Western-central and Alaskan birds are slightly larger than the eastern and Pacific coast populations.

Habitat


Scrub

Breeds in shrub thickets of riparian habitats, edges of beaver ponds, lakes, bogs, and overgrown clear-cuts of montane and boreal zone. Winters in tropical evergreen and deciduous forest, cloud forest, pine-oak forest, and forest edge habitat; also found in mangrove undergrowth, secondary growth, thorn-scrub, dry washes, riparian gallery forest, mixed forests, brushy fields, and plantations.

Food


Insects

Insects and occasional berries.

Nesting

Nesting Facts
Clutch Size
2–7 eggs
Egg Description
Creamy white with fine reddish spots.
Condition at Hatching
Helpless with sparse brown down.
Nest Description

Bowl of vegetation, lined with grass or hair. Usually placed on ground, at base of shrub or under bunches of grass. May be placed low in shrubs.

Nest Placement

Ground

Behavior


Foliage Gleaner

Picks insects from foliage and twigs, hovers to pick prey from leaves, and flycatches.

Conservation

status via IUCN

Least Concern

Wilson’s Warbler populations declined by 2.1 percent per year between 1966 and 2010, resulting in a cumulative decline of 61 percent, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 60 million with 61 percent spending some part of the year in the U.S., 39 percent in Canada, and 72 percent wintering in Mexico. The 2014 State of the Birds Report listed Wilson’s Warbler as a Common Bird in Steep Decline, and they rate a 10 out of 20 on the Partners in Flight Continental Concern Score. Degradation and loss of primary breeding habitat, western riparian woodlands, are likely among the leading causes of declines.

Credits

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