Double Square-spot

Xestia triangulum

The double square-spot is a moth of the family Noctuidae. It is distributed through most of Europe except the Mediterranean islands and northernmost Fennoscandia. In the East, the species ranges East across the Palearctic to Siberia and in the South-East to the Black Sea and in Iran. It rises to a height of about 2,000 metres (6,600 ft) in the Alps. 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 19°C (typically 17 to 19°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 51°N in June to 60°N in August, about 1,000 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.