Colostygia olivata
In 3 days ~30% in a week ~50%
Colostygia olivata, the beech-green carpet, is a moth of the family Geometridae. It was first described by Michael Denis and Ignaz Schiffermüller in 1775 and it is found in most of the Palearctic. The wingspan is 22–27 millimetres (0.87–1.06 in). Freshly hatched moths have green forewings. There is a darker, brown central band narrower towards the centre of the forewings. This band is edged with a white wavy line. The hindwings are smoky grey with a pale crossline. The larva is stout, slightly tapering at each end, rugose, with conspicuous tubercles and setae. It is reddish-ochreous or brownish ochreous with an interrupted grey dorsal line. The lateral and ventral surfaces are mostly dull reddish; tubercles black. The pupa is rather stout, bright red or red-brown, the abdomen darker.
Adults are in wing from May to August in one generation. The larvae feed on Galium species. Larvae can be found from September to May. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Ecrins National Park | 🇫🇷 France | |
| 3 | Pyrénées National Park | 🇫🇷 France |
With luck
About 10% of wildlife watchers report a Beech-Green Carpet sighting in Mercantour National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 272nd most-seen of the 412 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Beech-Green Carpet in Mercantour National Park on a given day, against under 5% in September to May, the lowest months. That is one of Mercantour National Park's driest months, with about 50 mm of rain against 140 mm in October.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Beech-Green Carpet sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Yes
Of the 3 parks where we can rate Beech-Green Carpet sightings, Mercantour National Park has the highest daily chance: about 10%. Next come Ecrins National Park (France, about 10%) and Pyrénées National Park (France, under 5%).
GBIF citizen-science records
It is estimated from how often the Beech-Green Carpet is recorded against all the insects logged in Mercantour 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.
