Black-throated Sparrow

Amphispiza bilineata

The black-throated sparrow is a species of bird in the family Passerellidae, the New World sparrows. It is found in Mexico and the United States. Source

Where it is now

In the last 8 weeks this bird was recorded 14,754 times across 10 areas (each area is a 5 degree square).

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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.