Anticlea derivata
In 3 days ~10% in a week ~30%
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 Sierra de Guadarrama National Park on a given day, based on 12 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 300th most-seen of the 597 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.
March and April
In those months about 10% of wildlife watchers report a The Streamer in Sierra de Guadarrama National Park on a given day, against under 5% in May to February, the lowest months.
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.
Yes
Of the 2 parks where we can rate The Streamer sightings, Sierra de Guadarrama National Park has the highest daily chance: under 5%. Next come Wadden Sea National Park (Germany, under 5%).
GBIF citizen-science records
It is estimated from how often the The Streamer is recorded against all the insects logged in Sierra de Guadarrama National Park (12 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.
