Portland Ribbon Wave
Idaea degeneraria
Idaea degeneraria, the Portland ribbon wave, is a moth of the family Geometridae. The species was first described by Jacob Hübner in 1799. Source
Where it is now
In the last 8 weeks this insect was recorded 51 times across 3 areas (each area is a 5 degree square).
See the Portland Ribbon Wave on the live map
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 | 20 April 2026 | 20 April 2026 | 18 May 2026 | 1 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.