Vesper Sparrow

Pooecetes gramineus

The vesper sparrow is a medium-sized New World sparrow. The only member of the genus Pooecetes, it is a pale sparrow with brown streaks that breeds across the grasslands of northern North America. It migrates to winter in the southern United States and Mexico. Source

Where it is now

In the last 8 weeks this bird was recorded 869 times across 31 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 15°C (typically 13 to 19°C, from 22 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 41°N in April to 51°N in July, about 1,200 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.