once upon a time there was a planet called copper 9 in that planet lived two kinds of drones werewolf drones and rabbit drones werewolf drones don't eat Rabbit drones but they are very tasty so they still eat them werewolf and rabbit both kinds of drone can eat human food and re-create the lost oil that they lost through by getting hurt eating human food of any kind is will replenish little bit it takes time to get more and read the book for more details