Large Tortoiseshell
Nymphalis polychloros
The large tortoiseshell or blackleg tortoiseshell is a butterfly of the family Nymphalidae. Source
Where it is now
No records in the last 8 weeks. It may be out of season where the observers and sensors are.
See the Large Tortoiseshell 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 | 16 March 2026 | 1 June 2026 | 16 March 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.