Acleris logiana
In 3 days ~10% in a week ~20%
Acleris logiana, the black-headed birch leaffolder moth or grey birch button, is a moth of the family Tortricidae. It was described by Carl Alexander Clerck in 1759. It is found in most of Europe, except Ireland, Portugal, most of the Balkan Peninsula and Ukraine.
It is also found in North America, the Russian Far East, Korea and Japan. The wingspan is 18–22 mm. Adults are on wing from September to April after overwintering. The larvae feed on Betula species. They feed between the spun leaves of their host plant. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Black-Headed Birch Leaffolder Moth sighting in Moscow on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 637th most-seen of the 1111 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
October
In that month about 10% of wildlife watchers report a Black-Headed Birch Leaffolder Moth in Moscow on a given day, against under 5% in November to September, the lowest months.
Only Moscow, in our data
Moscow is the only city on Wallace's Line with enough records to rate Black-Headed Birch Leaffolder Moth sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Black-Headed Birch Leaffolder Moth is recorded against all the insects logged in Moscow (11 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
