Chestnut-Sided Warbler (Setophaga pensylvanica) lives in deciduous forest across Eastern North America. It feeds on insects and spiders. Its conservation status is Least Concern.
Fascinating facts about the Chestnut-Sided Warbler
- Chestnut-sided warblers have thrived where mature forests have been cleared, because they readily colonise the abundant second-growth habitats that follow such disturbances. Their numbers begin to rise within a year after a clear-cut, taking advantage of the new shrub and young tree cover. This increase continues, reaching a peak seven to eight years after the initial clearing as the habitat matures.
- The male's song is a high-whistled line that ends with a sharp "MEECHA" phrase and is chiefly used to attract a mate, becoming less frequent once nesting is underway. In addition, males produce an unaccented version of the song, lacking the final phrase, which they employ mainly for territory defence and aggressive encounters with rivals.
- A hybrid between a chestnut-sided warbler and a magnolia warbler was first recorded on 25 May 2014 at Ontario's Long Point Bird Observatory. The individual was captured in a mist-net at the station's Old Cut research site, providing physical evidence of inter-species breeding. Genetic and morphological analyses indicated the mother was a chestnut-sided warbler and the father a magnolia warbler, confirming the rare hybridisation event.
- A breeding-plumaged male has been recorded as far west as British Columbia, far beyond its usual eastern range. The species normally breeds across eastern North America, extending from Saskatchewan to the Maritimes and south to north-west Georgia. It is usually found south of the 50°N latitude, so a western sighting is an unusual outlier. This record shows that occasional individuals can push the breeding frontier well beyond the core area.
- Chestnut-sided warblers occasionally turn up in western Europe, but such appearances are exceptionally uncommon. These birds are Neotropical migrants that normally travel between North America and Central America, beginning their fall migration from late August to late September after a May breeding start. During migration they mainly move east of the Rocky Mountains, passing through Mexico and the Greater Antilles rather than the Caribbean.
Sources
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At a glance
RangeEastern North America
HabitatDeciduous forest
DietInsects and spiders
About the Chestnut-Sided Warbler
As the Chestnut-Sided Warbler flits through the dense underbrush, its vibrant plumage flashes like a fleeting ember, illuminating the dappled shade with an unmistakable burst of color. With each swift, agile movement, it weaves a intricate tapestry of sound and motion, its melodic song ringing out as it navigates the complex web of twigs and leaves with effortless precision. In this whirlwind of activity, the warbler's unbridled energy and joie de vivre are a testament to the unspoiled beauty of its woodland realm.
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