Swallow Prominent

Pheosia tremula

Pheosia tremula, the swallow prominent, is a moth from the family Notodontidae. The species was first described by Carl Alexander Clerck in 1759. Source

Where it is now

In the last 8 weeks this insect was recorded 4 times across 1 area (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 15°C (typically 13 to 18°C, from 5 areas). That holds across 15° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in Europe ranged from 49°N in April to 61°N in July, about 1,400 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.