Swainson's Warbler

Limnothlypis swainsonii

Swainson's warbler is a small species of New World warbler. It is monotypic, the only member of the genus Limnothlypis. Swainson's warbler was named after William Swainson, an English ornithologist. Source

Where it is now

In the last 8 weeks this bird was recorded 188 times across 9 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 24°C (typically 19 to 27°C, from 7 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 23°N in September to 36°N in June, about 1,500 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.