Golden-winged Warbler

Vermivora chrysoptera

The golden-winged warbler is a small migratory insectivorous bird in the New World warbler family Parulidae. It breeds in southeastern and south-central Canada and in the Appalachian Mountains in the northeastern to north-central United States. The majority (~70%) of the global population breeds in Wisconsin, Minnesota, and Manitoba. Golden-winged warbler populations are slowly expanding northwards but are generally declining across its range. This is most likely as a result of habitat loss and competition/interbreeding with the very closely related blue-winged warbler, Vermivora cyanoptera, albeit the latter point has been debated. Populations are now restricted to two regions: the Great Lakes and the Appalachian Mountains. Source

Where it is now

In the last 8 weeks this bird was recorded 49 times across 8 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 19°C (typically 17 to 21°C, from 9 areas). That holds across 15° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in North America ranged from 37°N in April to 46°N in May, about 1,000 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.