What do Australian Rhino Beetles eat?

Rhino beetles are scarab beetles belonging to the subfamily Dynastinae. There are many species and each species has its own food preferences. Larvae of the coconut rhinoceros beetle, Oryctes rhinoceros, usually feed on decaying plant material, especially coconut logs, but they can also be found in manure. In the lab, we are rearing them on a steer manure blend which we purchase from garden stores. In Japan, where kids keep rhino beetles as pets, pet stores sell a special jelly for the larvae.