Drymonia querna
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report an Oak Marbled Brown sighting in Porto on a given day, based on 45 verified sightings from GBIF citizen-science data. It is the 134th most-seen of the 498 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
May–June and August–September
In those months about 10% of wildlife watchers report an Oak Marbled Brown in Porto on a given day, against under 5% in July and October–April, the lowest months. Those are among Porto's driest months, with about 40 mm of rain a month against 140 mm in January.
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.
Only Porto, in our data
Porto is the only city on Wallace's Line with enough records to rate Oak Marbled Brown sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Notodontidae
The closest relatives of the Oak Marbled Brown that you can see in Porto (family Notodontidae, Prominent Moths) are Buff-Tip (about 10%), Swallow Prominent (about 10%) and Pale Prominent (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Oak Marbled Brown is recorded against all the insects logged in Porto (45 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.
