Cassin's Sparrow

Peucaea cassinii

Cassin's sparrow is a medium-sized sparrow. Source

Where it is now

In the last 8 weeks this bird was recorded 712 times across 5 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 26°C (typically 23 to 27°C, from 5 areas). That holds across 15° of latitude, which suggests its timing follows temperature more than the calendar.

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.