Yellow Shell

Camptogramma bilineata

Camptogramma bilineata, the yellow shell, is a colourful moth of the family Geometridae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It can be found in Europe and east across the Palearctic to the Altai Mountains. Source

Where it is now

In the last 8 weeks this insect was recorded 267 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 19°C (typically 15 to 23°C, from 11 areas).

Over the weeks it was present in the past year, its centre in Europe ranged from 48°N in May to 56°N in June, about 900 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.