Drymonia querna
In 3 days ~10% in a week ~20%
Drymonia querna, the oak marbled brown, is a moth of the family Notodontidae. It is found in the Middle East and mainland Europe except the north. The wingspan is 38–43 mm.The body and forewing are dark grey-brown, the latter with a slight reddish violet tone and sharply marked white lunule at apex of cell; before and again after the centre a black transverse line, the proximal one straight and only in front of hind margin curved outward, the distal one dentate with white edge, from which extend short black vein-streaks towards the margin; a light submarginal line undulate. Hindwing white in male, of a brownish tint in female. Larva green, with numerous minute whitish spots and approximated whitish subdorsal lines; on a level with the black-margined spiracles a red-edged longitudinal stripe which is interrupted at the segmental
incisions; head greenish. May-June and August-October on Oak-bushes. Pupa black, in the ground in a cell lined with silk. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
Rare
Under 5% of wildlife watchers report an Oak Marbled Brown sighting in Sierra de Guadarrama National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 473rd most-seen of the 597 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.
May and June
In those months about 10% of wildlife watchers report an Oak Marbled Brown in Sierra de Guadarrama National Park on a given day, against under 5% in July to April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Oak Marbled Brown 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 Oak Marbled Brown sightings, Sierra de Guadarrama National Park has the highest daily chance: under 5%. Next come Pyrénées National Park (France, under 5%).
GBIF citizen-science records
It is estimated from how often the Oak Marbled Brown is recorded against all the insects logged in Sierra de Guadarrama National Park (8 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.
