Beowulf beetle (Dynastes beowulf) is a species of rhinoceros beetle. The adult body size is between 2 and 2,3 m in length without the thoracic horn. This species is highly sexually dimorphic with only females possessing the giant horns they are known for which they use for combat to win possession and mating rights to a male. In these fights, the females attempt to grab their rival to throw them. The reason for this behaviour is the male’s tight mating window with them only being able to mate for around 2 months. Beowulf beetle larvae resides within stalks of large fungus and grows for around 2 years in which it goes through 3 metamorphosis stages. Adults feed on glowing gills of giant fungus are attracted to 390-510 nm wavelengths of light.