Epirrita dilutata
In 3 days ~20% in a week ~30%
The November moth (Epirrita dilutata) is a moth of the family Geometridae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. It can be found in the Palearctic realm in western Europe from central Scandinavia to the Mediterranean the Caucasus and western Russia.
The wingspan is 38–44 mm, the forewings being variably marked with alternating pale and dark bands. The forewing ground colour is pale with darker grey and tinted brown. It has wavy lines. The hindwing is white grey with two lines. The distal fascia points in to the discal spot.
Melanism is common and in some locations all-dark individuals make up the majority of the population. The species is extremely similar to three of its relatives, the pale November moth, the autumnal moth and the small autumnal moth and they cannot usually be separated without examination of the genitalia. See Townsend et al.
The November moth flies at night from September to November, and is attracted to light and sometimes to nectar-rich flowers. The caterpillar is found in late spring, and is green with red markings and feeds on a wide range of trees and shrubs. The species overwinters... Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a November Moth sighting in Porto on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 223rd most-seen of the 498 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.
December
In that month about 30% of wildlife watchers report a November Moth in Porto on a given day, against under 5% in February to October, the lowest months. That is one of Porto's wettest months, with about 120 mm of rain against 15 mm in July.
Yes
Of the 2 cities where we can rate November Moth sightings, Porto has the highest daily chance: about 10%. Next come Prague (Czechia, under 5%).
Same family: Geometridae
The closest relatives of the November Moth that you can see in Porto (family Geometridae, Geometer Moths) are Double-Striped Pug (about 20%), Vestal (about 20%) and Pale Oak Beauty (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the November Moth is recorded against all the insects logged in Porto (22 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.
