Chestnut-coloured Carpet

Thera cognata

Thera cognata, the chestnut-coloured carpet or Durham juniper moth, is a moth of the family Geometridae. The species was first described by Carl Peter Thunberg in 1792. It is found in Europe, Asia Minor, the Caucasus and Transcaucasus. Source

Where it is now

In the last 8 weeks this insect was recorded 16 times across 2 areas (each area is a 5 degree square).

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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.