Brown-Toed Forest Fly

Xylota segnis

Xylota segnis, the brown-toed forest fly, is a common species of hoverfly. Source

Where it is now

In the last 8 weeks this insect was recorded 29 times across 4 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 13°C (typically 12 to 13°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 52°N in April to 61°N in July, 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.