european grass snake or ringed snake (natrix natrix) in the canyon of the krupa river (velebit nature park)

european grass snake ringed natrix canyon krupa river velebit nature park croatia zmija bjelouska kanjonu rijeke krupe prirode hrvatska die ringelnatter schlange kroatien animal reptile wildlife wild predator herpetology fauna green skin natural outdoor closeup background zoology tongue danger serpent water hunter reptilian reptilia crawling detail dangerous lake pond summer camouflage portrait creature outdoors pattern environment scale close-up grass-snake forest spring collar wilderness attack species forked vertebrate colubridae close slither fear