MacGillivray's Warbler

Geothlypis tolmiei

MacGillivray's warbler is a species of bird in the family Parulidae, the New World warblers. It is found from southeastern Alaska and western Canada to Panama. Source

Where it is now

In the last 8 weeks this bird was recorded 15,513 times across 30 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 22°C (typically 13 to 24°C, from 19 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in North America ranged from 13°N in January to 57°N in July, about 4,800 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.