black grass snake (natrix natrix) on the ground in summer. eurasian non-venomous snake showing the yellow

animal grass snake wildlife amphibian animals big black close closeup collar color crawling creature dark distinctive environment eurasian eye fauna grasssnake grey ground head heat lake macro nature nonvenomous organism outdoors pattern pond portrait predator reptile ringed scaly serpent summer sunbathing tail vegetation warm water wet wild wilderness yellow close-up shot natrix summer non-venomous showing