Ladder-backed Woodpecker

Dryobates scalaris

The ladder-backed woodpecker is a North American woodpecker. Source

Where it is now

In the last 8 weeks this bird was recorded 59,081 times across 16 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 29°C (typically 15 to 36°C, from 7 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in North America ranged from 26°N in July to 34°N in January, about 900 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.