Drepana curvatula
In 3 days ~20% in a week ~40%
Drepana curvatula, the dusky hook-tip, is a moth of the family Drepanidae. It was first described by Moritz Balthasar Borkhausen in 1790 and it is found from Europe to Japan. The wingspan is 34–42 mm. The moth flies from May to August depending on the location.
The larvae feed on alder, oak and birch. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pyrénées National Park | 🇫🇷 France | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
With luck
About 10% of wildlife watchers report a Dusky Hook-Tip sighting in Porto on a given day, based on 38 verified sightings from GBIF citizen-science data. It is the 167th most-seen of the 498 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
August
In that month about 20% of wildlife watchers report a Dusky Hook-Tip in Porto on a given day, against under 5% in May–July and October–March, the lowest months. That is one of Porto's driest months, with about 20 mm of rain against 140 mm in January.
Between 11 pm and 2 am
Across all the parks we cover, that three-hour window holds the most Dusky Hook-Tip sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Only Porto, in our data
Porto is the only city on Wallace's Line with enough records to rate Dusky Hook-Tip sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Drepanidae
The closest relatives of the Dusky Hook-Tip that you can see in Porto (family Drepanidae, Hooktip and False Owlet Moths) are Spiny Hook-Tip (about 10%), Buff Arches (about 10%) and Peach Blossom Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dusky Hook-Tip is recorded against all the insects logged in Porto (38 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.
