Reptile
Common adder
Vipera berus · Viperidae
Best monthsApr–May · Julmost records
Records136,073in 36 countries
Most seen inUnited Kingdom34,557 records
Red ListLeast concernIUCN status
About
Common adder in brief
The common adder (Vipera berus) is a reptile of the Viperidae family — species of snake belonging to the viper family (Viperidae).
Across the 36 countries we cover it has 136,073 published records, most of them from the United Kingdom, the Netherlands and Sweden. It is strongly seasonal: records peak in April, May and July and fall to their lowest in January and December.
Its global conservation status is least concern on the IUCN Red List.
Records by month
All countries combined · the strongest months highlightedJFMAMJJASOND
Where & when
When to look in each country
United Kingdom34,557 records · best Apr, Mar
Netherlands28,234 records · best Apr, Mar
Sweden14,409 records · best May, Apr
Finland8,803 records · best May, Jul
France8,460 records · best Apr, May
Norway8,110 records · best May, Jul
Denmark7,767 records · best Apr, May
Austria6,570 records · best Jul, Aug
Germany5,234 records · best Apr, Jul
Russia4,527 records · best May, Jun
Poland2,669 records · best May, Apr
Switzerland1,646 records · best Aug, May
Italy1,249 records · best Aug, Jul
Ukraine927 records · best May, Apr
Estonia716 records · best May, Jun
Czechia530 records · best May, Aug
Belgium400 records · best May, Apr
Slovakia211 records · best May, Jun
Romania189 records · best Jul, Aug
Slovenia143 records · best Jul, Jun
Hungary122 records · best Aug, May
Bulgaria121 records · best Jul, Aug
Lithuania105 records · best Sep, May
Belarus95 records · best May, Apr
Bosnia and Herzegovina61 records · best Jul, May
Latvia57 records · best Aug, Jul
Croatia55 records · best Apr, Jun
Montenegro42 records · best Jun, May
Kazakhstan15 records · best Aug, Jun
Albania14 records · best Jun, Jul
North Macedonia8 records · best Jul, May
Liechtenstein7 records · best Aug, May
Serbia7 records · best Jun, May
Kosovo7 records · best Jun, Oct
North Korea5 records · best May, Jun
Kyrgyzstan1 records · best Jan, Feb
Map
Where it has been recorded
Density of published records; brighter cells have more records.
Relatives
All reptilesMore of the Viperidae family
Photo: Gary Stolz (original) · Public domain · Wikimedia CommonsReport this photo · linked, not stored
Western Diamond-backed Rattlesnake
Crotalus atrox
%2C%20Seitenansicht.jpg){kind=link}