American Redstart

Setophaga ruticilla

The American redstart is a New World warbler. It is only distantly related to the Old World (common) redstart, with both belonging to the order Passeriformes. Source

Where it is now

In the last 8 weeks this bird was recorded 61,094 times across 57 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 14 to 24°C, from 44 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 24°N in September to 49°N in July, about 2,700 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.