Sphrageidus similis
In 3 days ~10% in a week ~30%
The yellow-tail, goldtail moth or swan moth (Sphrageidus similis) is a moth of the family Erebidae. The species was first described by Johann Kaspar Füssli in 1775, and has commonly been placed within the related genus Euproctis. It is distributed throughout Europe to the Urals, then east across the Palearctic to Siberia and south to India and Sri Lanka.
This species has a wingspan of 35–45 mm, the female usually noticeably larger than the male. All parts of the adults are pure white, apart from a bright yellow tip to the abdomen (larger in the female) and a small black or brown tornal mark on the forewing of the male.
White, and very like Euproctis chrysorrhoea, but more pure silky white, anal wool and hairs at the apex of the abdomen of the female golden yellow. Not rarely, especially in the male sex, color forms occur with small dark spots on the forewing: form "auriflua" has three spots at the inner angle, forming an oblique transverse row, and one spot in the basal area near the hindmargin; form "nyctea" has only one spot at the inner angle as well as one in the basal area like "auriflua"; form "trimaculata" is like "nyctea" but has another... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Białowieża National Park | 🇵🇱 Poland | |
| 3 | Wadden Sea National Park | 🇩🇪 Germany | |
| 4 | Pyrénées National Park | 🇫🇷 France | |
| 5 | Bavarian Forest National Park | 🇩🇪 Germany |
Rare
Under 5% of wildlife watchers report a Swan Moth sighting in Bavarian Forest National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 822nd most-seen of the 1115 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 Swan Moth in Bavarian Forest National Park on a given day, against under 5% in September to June, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Swan Moth sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
5th of 5
Of the 5 parks where we can rate Swan Moth sightings, Bavarian Forest National Park ranks 5th at under 5%. The best odds are in Snowdonia National Park (United Kingdom, about 20%), Białowieża National Park (Poland, about 10%) and Wadden Sea National Park (Germany, about 10%).
Same family: Erebidae
The closest relatives of the Swan Moth that you can see in Bavarian Forest National Park (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Burnet Companion (about 20%), Jersey Tiger (about 20%) and Pale Tussock Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Swan Moth is recorded against all the insects logged in Bavarian Forest National Park (8 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.
