One of the largest beetles of the world endemic to western Mexico. Males reach lengths of 12 cm and more; females are slightly smaller and lack the prominent horns. Adults feed on rotting fruit and live only around 4 months. In the forests of Puerto Vallarta, the adults can be seen only in between October and February. Larvae eat decomposing wood and need full 3 years to attain optimum size. Although heavy, these beetles fly quite well. Note the incredible size of this adult male (compared to a hand of an adult person).