Drepana falcataria
In 3 days ~30% in a week ~50%
Drepana falcataria, the pebble hook-tip, is a moth of the family Drepanidae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is found in Europe, through Siberia to the eastern Palearctic.
The wingspan is 27–35 mm. The ground colour is light brown or white brown to reddish brown. The forewings, which exhibit a fine regular pattern of dark, finely serrated lines have a dark patch in the middle. Under the sickle, or on the outer part of the outer edge of the wing, there is a purple stain. From the wing tip, a clearly curved, dark brown band runs under the stain up to the edge of the wing. The hindwings are also light brown, but brighter than the forewings. Their pattern is similar to but not so strong as that of the forewings. In the females the hindwings are white with the same dark patterning.
The egg is yellow marked with orange at one end. The last instar caterpillar is green, the dorsum reddish brown, except towards the black-marked yellowish head. There are two conspicuous warts on rings two and five, and less obvious raised spots on the other rings, all bearing hairs. In the younger stages it is blackish, with white marks on the fourth and seventh rings; later it becomes greenish below, and the markings on the back of rings four, seven, eight, and ten are whitish or creamy.
They prefer riparian forest and carr but are also found on the edge of moors and in parks and gardens. They are widespread and common. The moth flies from April to August depending on the location. The larvae feed on birch and sometimes alder. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 2 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 3 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Liverpool | 🇬🇧 United Kingdom | |
| 2 | Essen | 🇩🇪 Germany | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Helsinki | 🇫🇮 Finland | |
| 5 | Manchester | 🇬🇧 United Kingdom | |
| 6 | Berlin | 🇩🇪 Germany | |
| 7 | London | 🇬🇧 United Kingdom | |
| 8 | Moscow | 🇷🇺 Russia |
With luck
About 10% of wildlife watchers report a Pebble Hook-Tip sighting in Snowdonia National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 202nd most-seen of the 387 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Pebble Hook-Tip in Snowdonia National Park on a given day, against under 5% in September to April, the lowest months.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Pebble Hook-Tip sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 4 parks where we can rate Pebble Hook-Tip sightings, Snowdonia National Park has the highest daily chance: about 10%. Next come Bavarian Forest National Park (Germany, about 10%) and Cairngorms National Park (United Kingdom, about 10%).
Same family: Drepanidae
The closest relatives of the Pebble Hook-Tip that you can see in Snowdonia National Park (family Drepanidae, Hooktip and False Owlet Moths) are Peach Blossom Moth (about 20%), Buff Arches (about 10%) and Satin Lutestring (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Pebble Hook-Tip is recorded against all the insects logged in Snowdonia National Park (10 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.
