Peregrine Falcon

Falco peregrinus

The peregrine falcon, also referred to simply as the peregrine, is a bird of prey (raptor) in the family Falconidae known for its speed. A large, crow-sized falcon, it has a blue-grey back, barred white underparts and a black head. As is typical for bird-eating (avivore) raptors, peregrine falcons are sexually dimorphic, with females being considerably larger than males. Historically, the bird has also been known as the "black-cheeked falcon" in Australia and the "duck hawk" in North America. Source

Where it is now

In the last 8 weeks this bird was recorded 30,396 times across 161 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 25°C (typically 16 to 29°C, from 17 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 17°N in February to 51°N in January, about 3,800 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.