Blue-gray Gnatcatcher

Polioptila caerulea

The blue-gray gnatcatcher is a very small gnatcatcher native to North America. Source

Where it is now

In the last 8 weeks this bird was recorded 353,459 times across 44 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 18 to 25°C, from 33 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 23°N in January to 36°N in May, about 1,400 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.