These very large beetles, Chalcosoma atlas, come from Tropical Asia, where they are often kept as pets. Males are usually much larger than females, and have very large, stiff horns. These impressive horns are harmless to people, but are used to battle other males for the right to mate with a female.
The large grubs develop in the ground while feeding on rotten logs, soil, and leaf litter. They can take 3 years to complete this stage. When they are large enough, they form a pupa and in a few months, the adult beetle emerges. Adult Atlas beetles feed on rotten fruit and sap.