Well, we thought they were leafcutters, but on closer inspection it turns out they’re carrying berries, not leaves. They harvest them here at the bottom right. Then form up a line carrying them across the grass. When we’re out hiking we see signs informing us that “It only takes ten people to create a new trail, please stay on the path.” Maybe ten thousand ant steps equals ten people steps, but they have clearly trampled a trail through the grass. Across the road. And down into this hole! That’s got to be some cavern down there to handle this steady stream of goods.