Acorn Woodpecker

Melanerpes formicivorus

The acorn woodpecker is a medium-sized woodpecker with a length of around 20 cm (8 in), and an average weight of 85 g (3.0 oz). It is found across Central America, as well as North into the western United States and South into parts of Colombia. Source

Where it is now

In the last 8 weeks this bird was recorded 1,050,459 times across 23 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in North America ranged from 25°N in January to 37°N in April, about 1,400 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.