Birds
Canada Warbler
Cardellina canadensis · also called Canada warblers
A Canada warbler arrives on its northern breeding grounds later than nearly any other warbler species, and it wastes no time once it does, since a journey all the way to the Andes and back leaves precious little of the year free for raising a family.
Overview
The Canada warbler, Cardellina canadensis, is a boldly patterned songbird native to damp, shrubby forest habitat across much of Canada and the northeastern United States. Its distinctive necklace pattern, unusually compressed breeding season, and remarkably long migration to the northern Andes of South America make it one of the more logistically demanding life histories among North American warblers.
A life squeezed between two long journeys
With such a long migration at both ends of the year, the Canada warbler has little choice but to compress its entire breeding effort into a shorter window than most of its relatives, arriving late and departing early by necessity rather than preference.
Status
Near Threatened, with populations declining due to habitat loss at both its breeding grounds in Canada and the northeastern United States and its wintering grounds in the northern Andes of South America.
Canada Warbler: common questions
Why does the Canada warbler have such a short breeding season?
This species arrives on its breeding grounds later than most other warblers and begins its fall migration earlier, a combination that leaves it with one of the shortest breeding windows of any North American warbler, requiring it to complete nesting, incubation, and raising its young within a comparatively narrow stretch of time each year.
How can you identify a Canada warbler?
Look for a distinctive necklace of bold black streaks crossing an otherwise bright yellow chest, set against a slate-grey back, a striking pattern unlike most other North American warblers, along with the species' active, often flycatching foraging style in damp, shrubby forest understory.
Why has the Canada warbler declined?
Population declines are generally linked to the loss of both breeding habitat, damp, shrubby forest understory across Canada and the northeastern United States, and wintering habitat in the northern Andes of South America, a combination of pressures at both ends of the species' long annual migration that has contributed to its classification as a species of conservation concern.
How far does the Canada warbler migrate?
This species travels an unusually long distance for its size, migrating all the way from its breeding grounds in Canada and the northeastern United States to the northern Andes and adjacent parts of South America for the winter, one of the longer migratory journeys undertaken by any North American warbler relative to its small body size.