Catoptria falsella
In 3 days ~10% in a week ~30%
Catoptria falsella, the chequered grass-veneer, is a species of moth of the family Crambidae. It is found in Europe. It is nocturnal. The wingspan is 18–24 mm. (or a forewing length of 8 to 9 mm.The ground colour of the forewings is white, brown and yellowish-brown often dusted with stripes of brown. A narrow white longitudinal line extending from the base of the wing reaches past the middle of the wing. In the outer area, just before the margin, there is a strongly bulged transverse line with a point in the recess to the inner edge. The transverse line is crossed in the bulge by three thin dark longitudinal lines starting from the tip of the white longitudinal line. The hind wings are brown-grey.
The caterpillars are greenish and have a brownish head and a brownish neck shield. The moth flies from June to September depending on the location. The larvae feed on various mosses, especially Tortula muralis. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mercantour National Park | 🇫🇷 France | |
| 2 | Vanoise National Park | 🇫🇷 France | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Pyrénées National Park | 🇫🇷 France | |
| 6 | Ecrins National Park | 🇫🇷 France | |
| 7 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kharkiv | 🇺🇦 Ukraine | |
| 2 | Kyiv | 🇺🇦 Ukraine | |
| 3 | Helsinki | 🇫🇮 Finland | |
| 4 | Nizhny Novgorod | 🇷🇺 Russia | |
| 5 | Vienna | 🇦🇹 Austria | |
| 6 | London | 🇬🇧 United Kingdom | |
| 7 | Prague | 🇨🇿 Czechia | |
| 8 | Saint Petersburg | 🇷🇺 Russia | |
| 9 | Essen | 🇩🇪 Germany | |
| 10 | Moscow | 🇷🇺 Russia |
Rare
Under 5% of wildlife watchers report a Chequered Grass-Veneer sighting in London on a given day, based on 40 verified sightings from GBIF citizen-science data. It is the 585th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
August
In that month about 10% of wildlife watchers report a Chequered Grass-Veneer in London on a given day, against under 5% in September to July, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Chequered Grass-Veneer 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.
6th of 11
Of the 11 cities where we can rate Chequered Grass-Veneer sightings, London ranks 6th at under 5%. The best odds are in Kharkiv (Ukraine, about 10%), Kyiv (Ukraine, about 10%) and Helsinki (Finland, about 10%).
GBIF citizen-science records
It is estimated from how often the Chequered Grass-Veneer is recorded against all the insects logged in London (40 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.
