Colostygia olivata
In 3 days ~20% 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 Ecrins National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 168th most-seen of the 251 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
July to September
In those months about 10% of wildlife watchers report a Beech-Green Carpet in Ecrins National Park on a given day, against under 5% in October to June, the lowest months.
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.
Among the best
Of the 3 parks where we can rate Beech-Green Carpet sightings, Ecrins National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Mercantour National Park (France, about 10%).
Same family: Geometridae
The closest relatives of the Beech-Green Carpet that you can see in Ecrins National Park (family Geometridae, Geometer Moths) are Chimney-Sweeper (about 20%), Latticed Heath (about 10%) and Shaded Broad-Bar (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Beech-Green Carpet is recorded against all the insects logged in Ecrins 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.
