Thyraylia nana
In 3 days ~10% in a week ~20%
Cochylis nana is a moth of the family Tortricidae. It was described by Adrian Hardy Haworth in 1811. It is found in Europe, Amur Oblast of Russia and Nova Scotia in Canada. The wingspan is 9–12 millimetres (0.35–0.47 in).The head is white. The forewing costa is gently arched. The ground colour is white. The basal area and costa are strigulated with blackish. There is a broad direct median fascia of blackish irroration and strigulae, dilated dorsally, the posterior edge sinuate. The apical area is clouded with pale ochreous, with a suffused spot of blackish irroration on costa before the apex, sometimes indistinctly connected with the tornus. The cilia are pale ochreous, with indistinct bars of blackish irroration. The hindwings are pale grey. Julius von Kennel provides a full description.
The moth flies from mid-April to mid-June. The larvae feed on birch species. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Birch Conch sighting in Moscow on a given day, based on 13 verified sightings from GBIF citizen-science data. It is the 581st most-seen of the 1111 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Birch Conch in Moscow on a given day, so our monthly data shows no clear season.
Among the best
Of the 3 cities where we can rate Birch Conch sightings, Moscow ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Helsinki (Finland, under 5%).
GBIF citizen-science records
It is estimated from how often the Birch Conch is recorded against all the insects logged in Moscow (13 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.
