Anticlea derivata
In 3 days ~10% in a week ~20%
Anticlea derivata, the streamer, is a moth of the family Geometridae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. It is found in Europe, North Africa and across the Palearctic up to the Altai Mountains.It prefers to live on sunny slopes, hedge rows, bushy places as well as in gardens and parks.
Its wingspan is 30–34 mm and its most common colours are light brown and light grey, tints of pink are also present. A narrow, dark lateral band is located near the base of the forewings. The basal region is limited by a slightly curved, blackish transverse band. A large dark triangle costal patch which becomes a jagged line gets thinner towards the inner edge and is a unique pattern. The hindwings are brown grey and show a faint cross line.
The long caterpillar is green, inclining to yellowish between the segments; a purplish, or reddish-brown, stripe along the back is broken up into diamond-shaped spots on the middle segments. Sometimes the spots are reduced only to the areas behind the head and to the segment bearing the rearmost pair of legs.
The moth flies from March to May depending on the location. The larvae feed on species of rose. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 2 | Wadden Sea National Park | 🇩🇪 Germany |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Birmingham | 🇬🇧 United Kingdom | |
| 2 | London | 🇬🇧 United Kingdom | |
| 3 | Prague | 🇨🇿 Czechia |
Rare
Under 5% of wildlife watchers report a The Streamer sighting in Wadden Sea National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 699th 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 20%, if each day is a fresh chance.
April
In that month about 10% of wildlife watchers report a The Streamer in Wadden Sea National Park on a given day, against under 5% in May to March, the lowest months. That is one of Wadden Sea National Park's driest months, with about 45 mm of rain against 140 mm in November.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most The Streamer sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 2 parks where we can rate The Streamer sightings, Wadden Sea National Park ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Sierra de Guadarrama National Park (Spain, under 5%).
GBIF citizen-science records
It is estimated from how often the The Streamer is recorded against all the insects logged in Wadden Sea National Park (5 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.
