Caloptilia cuculipennella
In 3 days ~10% in a week ~20%
Caloptilia cuculipennella (commonly known as the feathered slender) is a moth of the family Gracillariidae. It is found in Holarctic Region, including most of Europe. The wingspan is 11–12 millimetres (0.43–0.47 in).The posterior tibiae are smooth above. Forewings are whitish, with numerous ochreous or brown strigulae finely irrorated with black; an oblique
fascia near base hardly reaching costa, a second before middle hardly reaching dorsum, a third beyond middle interrupted in disc, and a costal spot at 3/4 ochreous or brownish, finely irrorated with black. Hindwings are dark grey. The larva is green -whitish; head and plate of 2 brown.
The moth flies from July to September.The larvae feed on Fraxinus excelsior, Ligustrum vulgare and Syringa vulgaris. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | London | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Feathered Slender sighting in London on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 1300th 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 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 Feathered Slender in London on a given day, so our monthly data shows no clear season.
Only London, in our data
London is the only city on Wallace's Line with enough records to rate Feathered Slender sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Gracillariidae
The closest relatives of the Feathered Slender that you can see in London (family Gracillariidae, Leaf Blotch Miner Moths) are Horse-Chestnut Leafminer (about 20%), Firethorn Leafminer (about 10%) and London Midget (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Feathered Slender is recorded against all the insects logged in London (6 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.
