Ancylis achatana
In 3 days ~20% in a week ~30%
Ancylis achatana is a moth of the family Tortricidae. It is found from central and southern Europe including the United Kingdom and Ireland, east to the Baltic region, Asia Minor, Ukraine and Russia to the southern part of Trans-Ural.
The wingspan is 14–18 mm. The forewings are fuscous with thick subconfluent pale leaden-metallic striae. The costa is posteriorly strigulated with whitish. The basal patch is dark fuscous, mixed with leaden-metallic, edge bent. The central fascia is dark fuscous, ferruginous-mixed, sharply obliquely interrupted with leaden-metallic above middle. A triangular apical ferruginous-orange patch is sprinkled with dark fuscous and cut by a leaden-metallic stria. The hindwings are grey. The larva is blackish; head and plate of 2 black. Julius von Kennel provides a full description.
Adults are on wing from June to July. The larvae spin or roll together leaves of Crataegus or Prunus spinosa and feed within or nearby. Other recorded food plants include Prunus domestica, Prunus mahaleb, Cotoneaster, Pyrus communis, Malus domestica, Malus sylvestris, Rubus fruticosus, Salix caprea and Urtica. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Birmingham | 🇬🇧 United Kingdom |
With luck
About 10% of wildlife watchers report a Triangle-Marked Roller sighting in London on a given day, based on 77 verified sightings from GBIF citizen-science data. It is the 425th most-seen of the 1504 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Triangle-Marked Roller in London on a given day, against under 5% in August to May, the lowest months.
Among the best
Of the 3 cities where we can rate Triangle-Marked Roller sightings, London ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Liverpool (United Kingdom, about 10%).
GBIF citizen-science records
It is estimated from how often the Triangle-Marked Roller is recorded against all the insects logged in London (77 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.
