Aglais urticae
In 3 days ~20% in a week ~50%
The small tortoiseshell (Aglais urticae) is a colourful Eurasian butterfly in the family Nymphalidae. Adults feed on nectar and may hibernate over winter; in warmer climates they may have two broods in a season. While the dorsal surface of the wings is vividly marked, the ventral surface is drab, providing camouflage. Eggs are laid on the common nettle, on which the larvae feed.
It is a medium-sized butterfly that is mainly reddish orange, with black and yellow markings on the forewings as well as a ring of blue spots around the edge of the wings. It has a wingspan ranging from 4.5 to 6.2 cm. A bright foxy red ground-colour; the forewing with 3 black costal spots, whose interspaces are yellow, there being a larger black spot in the middle of the hindmarginal area and two smaller ones in the disc between the 3 radial and 2 median; hindwing with the basal half black; both wings with black submarginal band bearing blue spots. Underside of the forewing ochreous, with the costal spots as above, the apex and distal margin blackish; hindwing brown, basal half black with dentate edge, the whole surface with darker pencilling; at the distal margin... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Aigüestortes National Park | 🇪🇸 Spain | |
| 2 | Hohe Tauern National Park | 🇦🇹 Austria | |
| 3 | Tatra National Park | 🇸🇰 Slovakia | |
| 4 | Vanoise National Park | 🇫🇷 France | |
| 5 | Picos de Europa National Park | 🇪🇸 Spain | |
| 6 | Mercantour National Park | 🇫🇷 France | |
| 7 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 8 | Pyrénées National Park | 🇫🇷 France | |
| 9 | Ecrins National Park | 🇫🇷 France | |
| 10 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 11 | Triglav National Park | 🇸🇮 Slovenia | |
| 12 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 13 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 14 | Biebrza National Park | 🇵🇱 Poland | |
| 15 | Gauja National Park | 🇱🇻 Latvia | |
| 16 | Ordesa y Monte Perdido National Park | 🇪🇸 Spain | |
| 17 | Białowieża National Park | 🇵🇱 Poland | |
| 18 | Wadden Sea National Park | 🇩🇪 Germany | |
| 19 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 20 | Cévennes National Park | 🇫🇷 France | |
| 21 | Fertő-Hanság National Park | 🇭🇺 Hungary |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Ulaanbaatar | 🇲🇳 Mongolia | |
| 2 | Helsinki | 🇫🇮 Finland | |
| 3 | Birmingham | 🇬🇧 United Kingdom | |
| 4 | Manchester | 🇬🇧 United Kingdom | |
| 5 | Liverpool | 🇬🇧 United Kingdom | |
| 6 | Dublin | 🇮🇪 Ireland | |
| 7 | Leeds | 🇬🇧 United Kingdom | |
| 8 | Copenhagen | 🇩🇰 Denmark | |
| 9 | Novosibirsk | 🇷🇺 Russia | |
| 10 | Munich | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Small Tortoiseshell sighting in Rotterdam [The Hague] on a given day, based on 29 verified sightings from GBIF citizen-science data. It is the 70th most-seen of the 355 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
May
In that month about 20% of wildlife watchers report a Small Tortoiseshell in Rotterdam [The Hague] on a given day, against under 5% in September to February, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Small Tortoiseshell sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
21st of 30
Of the 30 cities where we can rate Small Tortoiseshell sightings, Rotterdam [The Hague] ranks 21st at about 10%. The best odds are in Ulaanbaatar (Mongolia, about 80%), Helsinki (Finland, about 30%) and Birmingham (United Kingdom, about 30%).
GBIF citizen-science records
It is estimated from how often the Small Tortoiseshell is recorded against all the insects logged in Rotterdam [The Hague] (29 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.
