Background
In France, populations of Orisiniâs Viper (Vipera ursinii) are known to exist in just 12 locations (with unconfirmed sightings in three other places). Its range covers around 9000 ha, of which 5750 ha (more than 60%) are part of the Natura 2000 network. The French populations are highly isolated from other European populations (the closest of ...