Tethea ocularis
In 3 days ~10% in a week ~20%
Tethea ocularis, the figure of eighty, is a moth of the family Drepanidae. The species was first described by Carl Linnaeus in his 1767 12th edition of Systema Naturae. It is found throughout Continental Europe and has a scattered distribution in England and Wales, although it is absent from Scotland and Ireland.
The wingspan is 35–45 mm; the dark brown forewings being marked with dark-centred white stigmata which do look rather like the number 80. The hindwings are grey. The species flies from May to July[1] and is attracted to light and sugar.
The grey and white larva feeds on poplar and aspen. The species overwinters as a pupa. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Figure Of Eighty sighting in Vienna on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1090th most-seen of the 1406 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 Figure Of Eighty in Vienna on a given day, so our monthly data shows no clear season.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Figure Of Eighty sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
6th of 7
Of the 7 cities where we can rate Figure Of Eighty sightings, Vienna ranks 6th at under 5%. The best odds are in Liverpool (United Kingdom, about 10%), Kyiv (Ukraine, under 5%) and Birmingham (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Figure Of Eighty is recorded against all the insects logged in Vienna (7 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.
