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 |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Birch Conch sighting in Helsinki on a given day, based on 9 verified sightings from GBIF citizen-science data. It is the 553rd most-seen of the 838 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.
June
In that month about 10% of wildlife watchers report a Birch Conch in Helsinki on a given day, against under 5% in July to May, the lowest months.
Yes
Of the 3 cities where we can rate Birch Conch sightings, Helsinki has the highest daily chance: under 5%. Next come Moscow (Russia, under 5%) and Toronto (Canada, under 5%).
Same family: Tortricidae
The closest relatives of the Birch Conch that you can see in Helsinki (family Tortricidae, Tortricid Leafroller Moths) are Barred Marble (about 10%), Common Marble (about 10%) and White-Foot Bell (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Birch Conch is recorded against all the insects logged in Helsinki (9 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.
