Adder
Vipera berus
- KingdomAnimalia (Animals)
- PhylumChordata (Cordats)
- ClassSquamata
- FamilyViperidae (Vipèrids)
- GenusVipera (Eurasian Vipers)
- SpeciesVipera berus (Adder)
Vipera berus, commonly known as the common European adder and the common European viper, is a species of venomous snake in the family Viperidae. The species is extremely widespread, and thus can be found throughout much of Europe, and as far as East Asia. There are three recognised subspecies. Known by a host of common names including common adder and common viper, the adder has been the subject of much folklore in Britain and other European countries. It is not regarded as especially dangerous; the snake is not aggressive and usually bites only when really provoked, stepped on, or picked up. Bites can be very painful, but are rarely fatal. Wikipedia →
30–40% of wildlife watchers report a Adder sighting in Snowdonia National Park, based on 71 days of visitor records from GBIF citizen-science data.
📅 Monthly Probability
☀️ When They're Spotted
Most active during daytime hours (6am–6pm) · across all parks (global)
Global Distribution
Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.
where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is) · parks where it occurs — tap a pin for the sighting probability there
Parks Where Found
| # | Park | Country | Probability |
|---|---|---|---|
| 1 | Tatra National Park | 🇸🇰 Slovakia | |
| 2 | Triglav National Park | 🇸🇮 Slovenia | |
| 3 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 4 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 5 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 6 | Wadden Sea National Park | 🇩🇪 Germany | |
| 7 | Cévennes National Park | 🇫🇷 France | |
| 8 | Gauja National Park | 🇱🇻 Latvia | |
| 9 | Biebrza National Park | 🇵🇱 Poland | |
| 10 | Białowieża National Park | 🇵🇱 Poland |
Quick answers
What are the chances of seeing a Adder in Snowdonia National Park?
About 35% of wildlife watchers report a Adder sighting in Snowdonia National Park, based on 71 days of visitor records from GBIF citizen-science data.
When is the best time to see Adder in Snowdonia National Park?
March has the highest sighting rate for Adder in Snowdonia National Park in our monthly data.