Apotomis betuletana
In 3 days ~20% in a week ~30%
Apotomis betuletana is a moth of the family Tortricidae. It is found in most of Europe. It is also found in the eastern part of the Palearctic realm. The wingspan is 16–20 mm. The forewings are white, sometimes partly ochreous - tinged, with some grey striae posteriorly. The basal patch and central fascia are dark brown, black -marked, the included space dark ashy-fuscous, all slightly whitish sprinkled, on fold sometimes more mixed with white. The posterior edge of fascia is nearly straight, followed in middle by a faint pinkish-ochreous tinge. Hindwings grey, darker posteriorly. The larva is green, incisions yellowish; dorsal and subdorsal lines grey-green; tubercular spots yellow; head yellow-green; plate of 2 pale green. Julius von Kennel provides a full description.
Adults are on wing from July to September. The larvae feed on Betula species. They spin and roll the leaves of their host plant. The larvae can be found from May to June. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland |
With luck
About 10% of wildlife watchers report a Birch Marble sighting in Wadden Sea National Park on a given day, based on 29 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 261st most-seen of the 818 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a Birch Marble in Wadden Sea National Park on a given day, against under 5% in September to June, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Birch Marble sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 2 parks where we can rate Birch Marble sightings, Wadden Sea National Park has the highest daily chance: about 10%. Next come Bavarian Forest National Park (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the Birch Marble is recorded against all the insects logged in Wadden Sea National Park (29 verified sightings from 2019 to 2026), 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.
