Why do you need a Bug

But not all the inhabitants of the swamps met the newcomers with fury. In one of the sorties, the soldiers found a huge, unflappable toad, nicknamed the Bug.
 
She was striking not only in size, but also in a calm, almost reasonable disposition. The soldiers quickly realized that if you share food with her, the animal becomes surprisingly obedient. The stagehands turned out to be incredibly hardy, capable of carrying heavy chests and luggage on their wide backs for hours.
 
Upon returning to Ericuria, the expedition brought with it several of these amazing creatures. Although they did not breed in captivity, their life expectancy turned out to be incredible. So a few Stags remained at the royal court, and others were bought up by aristocrats as living, indefatigable porters.