Horisme vitalbata
In 3 days ~10% in a week ~20%
Horisme vitalbata, the small waved umber, is a moth of the family Geometridae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. It occurs in Europe. The wingspan is 30–35 mm. The length of the forewings is 15–17 mm. The moths fly in two generations from May to June and again in August.[1]
The larvae feed on Clematis vitalba. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Pyrénées National Park | 🇫🇷 France |
Rare
Under 5% of wildlife watchers report a Small Waved Umber sighting in London on a given day, based on 20 verified sightings from GBIF citizen-science data. It is the 753rd 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.
July and August
In those months about 10% of wildlife watchers report a Small Waved Umber in London on a given day, against under 5% in September to June, the lowest months.
Between 6 and 9 am
Across all the parks we cover, that three-hour window holds the most Small Waved Umber sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Among the best
Of the 2 cities where we can rate Small Waved Umber sightings, London ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Barcelona (Spain, under 5%).
GBIF citizen-science records
It is estimated from how often the Small Waved Umber is recorded against all the insects logged in London (20 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.
