I saw one once, it was pushing a metal object backwards and forwards through the grass. As it pushed the grass was cut and fell over and then every so often it pushed all the grass into a pile and took it’s treasure away in a cart.

When I got home I told all my friends about the strange two legged one with its cart full of grass. I explained that the creature must worship the grass or eat it. They all laughed at me and said I’d made it up, after all who would be stupid enough to collect leaves by the cartload for no reason.