male of the stag beetle, lucanus cervus, sitting on oak tree. a rare and endangered beetle species with large mandibles, occurring

animal antler background beetle beetles big black bug cervus close closeup czech czechia endangered entomology environment europe european fauna forest giant green horned horns insect insecta invertebrate krivoklatsko krivoklkat large lucanus macro male mandibles natural nature oak protected rare republic stag stagbeetle summer tree wild wildlife wood