I read this in an old sci-fi short story collection. For some reason I have it in my head that it was titled "the folk" but that hasn't turned up any hits on the great Google machine.
In the story, these slow moving creatures all have sections of territory they move over. I think they harvest minerals (or something) with their snouts to survive.
There are "bull" creatures who are in better status in the hierarchy, which I believe means they get a better or larger territory.
This story stands out. No humans or even humanoids. Just, plop, you're on a distant world with strange creatures, with strange goals and strange lives. Strange to a human anyway. Please help me find this story. Please please. I loved it