Feathered Thorn
Colotois pennaria
The feathered thorn is a moth of the family Geometridae. It was first described by Carl Linnaeus in 1761. Source
Where it is now
In the last 8 weeks this insect was recorded 281 times across 10 areas (each area is a 5 degree square).
See the Feathered Thorn on the live map
Movement and weather
Over the weeks it was present in the past year, its centre in Europe ranged from 51°N in November to 62°N in September, about 1,300 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.
| Region | First arrival | Last arrival | Typical peak | Areas |
|---|---|---|---|---|
| Europe | 31 August 2026 | 21 September 2026 | 14 September 2026 | 2 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.