Fox Sparrow

Passerella iliaca

The fox sparrow is a large New World sparrow. It is the only member of the genus Passerella, although some authors split the species into four. Source

Where it is now

In the last 8 weeks this bird was recorded 45,152 times across 48 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 8°C (typically 3 to 13°C, from 24 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 52°N in July to 61°N in May, about 1,000 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.