Brown Creeper

Certhia americana

The brown creeper, also known as the American treecreeper, is a small songbird, the only North American member of the treecreeper family Certhiidae. Source

Where it is now

In the last 8 weeks this bird was recorded 1,392,192 times across 67 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 21°C (typically 14 to 25°C, from 31 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 43°N in November to 51°N in August, about 900 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.