Nematopogon swammerdamella
In 3 days ~10% in a week ~20%
Nematopogon swammerdamella is a moth of the family Adelidae. A medium-sized, brownish-yellow moth with long antennae. It is the largest of the Nematopogon species found in North Europe, and can otherwise be recognized by the fact that the forewing is rather pronounced triangular (more rounded in the other species). In addition, it begins to fly earlier in the spring than the other species in the genus. However, one often has to examine the genitalia to determine the species with certainty. The antennae are filamentous, yellowish, about two and a half times as long as the forewing in the male and about 1.8 times as long in the female. The head, forebody and forewing are ochre-yellow. The forewing is relatively wide and has a pronounced tip and hind corner, so that it becomes distinctly triangular. The wing fringes are yellowish, paler than the wing. The hind wing is grey with pale grey wing fringes. The tip may be slightly brownish.Meyrick - The moth has long, pale shining ochreous, faintly darker strigulated forewings and long antennae. The hindwings are pale grey; cilia whitish-ochreous. Head orange, face whitish. The wingspan is 17–21 mm.
To certainly determine... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Prague | 🇨🇿 Czechia | |
| 2 | Birmingham | 🇬🇧 United Kingdom | |
| 3 | London | 🇬🇧 United Kingdom |
Rare
Under 5% of wildlife watchers report a Large Longhorn sighting in London on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 895th 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.
April and May
In those months about 10% of wildlife watchers report a Large Longhorn in London on a given day, against under 5% in June to March, the lowest months.
Among the best
Of the 3 cities where we can rate Large Longhorn sightings, London ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Prague (Czechia, under 5%) and Birmingham (United Kingdom, under 5%).
GBIF citizen-science records
It is estimated from how often the Large Longhorn is recorded against all the insects logged in London (14 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.
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