Eulithis testata
In 3 days ~10% in a week ~20%
Eulithis testata, the chevron, is a moth of the family Geometridae. The species was first described by Carl Linnaeus in 1761. It is found in both the Palearctic and the Nearctic realms. In the Palearctic it ranges from Great Britain and Scandinavia, south to the Alps, east through Russia and the Russian Far East to Japan. In North America, it is found from Newfoundland to Vancouver Island and Alaska, south in the east to about New Jersey and in the west to Colorado.
The specific name testata is derived from the Latin testa (baked stone) and refers to the base color of the wing. The wingspan is 25–35 mm.. The forewings show a variety of ground colors ranging from pale yellow through orange yellow, reddish yellow to brown yellow, and purple brown. The midfield is always obscured and is bordered by lines, which reveal a significant bend and in addition show a nearly identical, parallel course. There are one or two more crosslines in the midfield, which also have a nearly parallel course, but are however much less developed. In the midfield also the cell stands out, the midfield bulges out and there is dark crossline. The marginal field is often brightened whitish brightened... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany | |
| 2 | Cairngorms National Park | 🇬🇧 United Kingdom |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland |
Rare
Under 5% of wildlife watchers report a Chevron Moth sighting in Helsinki on a given day, based on 8 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.
August
In that month about 10% of wildlife watchers report a Chevron Moth in Helsinki on a given day, against under 5% in September to July, the lowest months.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Chevron Moth sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Helsinki, in our data
Helsinki is the only city on Wallace's Line with enough records to rate Chevron Moth sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Eulithis
The closest relatives of the Chevron Moth that you can see in Helsinki (genus Eulithis) are Northern Spinach (about 10%) and The Phoenix (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Chevron Moth is recorded against all the insects logged in Helsinki (8 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.
