Osprey

Pandion haliaetus

The osprey, historically known as sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor, reaching more than 60 cm (24 in) in length and a wingspan of 180 cm (71 in). It is brown on the upperparts and predominantly greyish on the head and underparts. Source

Where it is now

In the last 8 weeks this bird was recorded 346,879 times across 172 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 16°C (typically 10 to 22°C, from 50 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 24°N in December to 41°N in August, about 2,000 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.