Beautiful Demoiselle

Calopteryx virgo

The beautiful demoiselle is a species of damselfly belonging to the family Calopterygidae. The species has been found in Europe, North Africa, and Western Asia, and is often found by fast-flowing waters. Source

Where it is now

In the last 8 weeks this insect was recorded 3 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 16°C (typically 15 to 19°C, from 7 areas). That holds across 20° 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 44°N in August to 57°N in July, about 1,500 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.