Cliff Swallow

Petrochelidon pyrrhonota

The cliff swallow or American cliff swallow is a member of the passerine bird family Hirundinidae, the swallows and martins. The generic name Petrochelidon is derived from the Ancient Greek petros meaning "stone" and khelidon (χελιδών) "swallow", and the specific name pyrrhonota comes from purrhos meaning "flame-coloured" and -notos "-backed". Source

Where it is now

In the last 8 weeks this bird was recorded 6,535 times across 57 areas (each area is a 5 degree square).

See the Cliff Swallow on the live map

Movement and weather

Each season it is first heard regularly where daytime highs are around 22°C (typically 16 to 26°C, from 32 areas). That range is wide, so temperature alone does not explain when it turns up.

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.

Download every area as CSV

Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.