Cardellina pusilla
The Wilson's Warbler is a diminutive and sprightly New World Warbler, instantly recognizable by its vibrant olive-green upperparts and bright yellow underparts, often earning it the affectionate nickname 'Golden Warbler'. Males sport a distinctive, glossy black cap, which can be duller or absent in females and immatures, serving as a key identification mark. Measuring approximately 10-12 cm (4-4.7 inches) in length, with a wingspan of 15-18 cm (6-7 inches) and weighing a mere 8-11 grams, this...
This species primarily inhabits dense, low, wet deciduous or mixed forests, particularly favoring willow and alder thickets, shrubby riparian zones, and regenerating clearcuts, typically at low to mid-elevations.
Their diet consists almost entirely of insects and spiders, including caterpillars, aphids, beetles, flies, and mosquitoes, supplemented occasionally with small berries; they forage by gleaning from foliage and frequently sallying or hovering for flying prey.
Wilson's Warblers are ceaselessly active diurnal birds, rarely perching still for more than a few seconds as they glean insects from foliage. Males are highly territorial during the breeding season, defending their patch with vigorous, chattering songs and aerial pursuits. Mating systems are gene...
The Wilson's Warbler boasts an extensive breeding range across North America, spanning from western and central Alaska, through much of Canada (British Columbia east to Newfoundland), and south into the Pacific Northwest (Washington, Oregon, northern California). Breeding populations also occur i...
Least Concern
- This species is named after Alexander Wilson, often called the 'Father of American Ornithology,' who described it in the early 19th century. - Despite its bright yellow plumage, its preference for dense undergrowth makes it surprisingly challenging to spot as it darts through vegetation. - Male...