Ruddy Darter

Sympetrum sanguineum

The ruddy darter is a species of dragonfly of the family Libellulidae. Source

Where it is now

In the last 8 weeks this insect was recorded 132 times across 11 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 24°C (typically 20 to 24°C, from 6 areas). That holds across 15° of latitude, which suggests its timing follows temperature more than the calendar.

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.