Northern Rough-winged Swallow

Stelgidopteryx serripennis

The northern rough-winged swallow is a small, migratory swallow. It is very similar to the southern rough-winged swallow, Stelgidopteryx ruficollis. Source

Where it is now

In the last 8 weeks this bird was recorded 32,007 times across 51 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 18°C (typically 13 to 25°C, from 39 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 18°N in February to 44°N in July, about 2,900 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.