Helotropha leucostigma
In 3 days ~10% in a week ~30%
Helotropha leucostigma, the crescent, formerly Celaena leucostigma is a moth of the family Noctuidae. It is found in the Palearctic realm (Europe, Russia, Armenia, Turkestan, Siberia, Russian Far East, Mongolia, Amur, Korea, Japan, and northeastern China).
The wingspan is 37–44 millimetres (1.5–1.7 in). Forewing dull dark brown, faintly reddish- tinged; the veins powdered with grey scales; the terminal area beyond subterminal line black-brown, except at apex: median area between subcostal vein and vein 1 somewhat darker than the rest of wing; inner and outer lines indistinctly double: the inner outwardly oblique, the outer bent on vein 5; claviform stigma hardly visible; orbicular stigma oblique, elliptical, of the ground colour, with paler annulus; the reniform white or dull yellow, containing a double dark lunule with pale centre; the outer edge of this dark inner lunule is sometimes obsolete, in which case the stigma appears more solidly yellowish or white; the space between outer and subterminal lines is always slightly, often visibly, paler than the ground colour; hindwing fuscous grey; — in the ab. lunina Haw. the outer fascia is conspicuously... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a The Crescent sighting in Wadden Sea National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 486th most-seen of the 818 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a The Crescent in Wadden Sea National Park on a given day, against under 5% in September to June, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most The Crescent sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is most active around dawn and dusk.
Only Wadden Sea National Park, in our data
Wadden Sea National Park is the only park on Wallace's Line with enough records to rate The Crescent sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Noctuidae
The closest relatives of the The Crescent that you can see in Wadden Sea National Park (family Noctuidae, Cutworm Moths and Allies) are Large Yellow Underwing (about 20%), Silver Υ (about 20%) and Flame Shoulder Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the The Crescent is recorded against all the insects logged in Wadden Sea National Park (11 verified sightings from 2019 to 2026), 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.
