Bald Eagle

Haliaeetus leucocephalus

The bald eagle is a bird of prey found in North America. A sea eagle, it has two known subspecies and forms a species pair with the white-tailed eagle, which occupies the same niche as the bald eagle in the Palearctic. Its range includes most of Canada and Alaska, all of the contiguous United States, and northern Mexico. It is found near large bodies of open water with an abundant food supply and old-growth trees for nesting. Source

Where it is now

In the last 8 weeks this bird was recorded 137,724 times across 66 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 27°C (typically 9 to 34°C, from 20 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 41°N in November to 56°N in June, about 1,700 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.