Xylotrupes ulysses

Xylotrupes ulysses, common names "elephant beetle", "coconut palm beetle",[2] "common rhinoceros beetle" or simply "rhinoceros beetle"[3][4] is a species of rhinoceros beetle native to New Guinea. Male horns in several groups of this genus represent a special secondary sex characteristic. There is a bimodal horn-size distribution and there is a discrete male mating behavior correlated with each phenotype.[5]