male stag beetle with long and sharp jaws in wild forest sitting on the trunk of an oak tree

alone animal beetle biology brown bug cervus claw coleoptera endangered entomological entomology exoskeleton eye fauna fer flower giant green hirschkacurren horn horned incredible insect invertebrate leaf lucanidae lucanus male monster muelleri natural nature one organism phalacrognathus pincers prosopocoilus rhinoceros scarab selective spring stag stagbeetle strong summer tree view wild wildlife wood