“Thing was, the westward portage rope was attached to Billie’s harness, and Billie, for all her advantages as a draft animal, is about as smart as damp moss when it comes to things like “noticing external stimuli.” She’s a genework Indricothere (link by ed) that my Uncle Ren and I bought from a fly-by firm about six years back—a sort of precursor to the rhinoceros, and one of the largest land mammals ever to walk on the planet. When she put down her foot, the ground shook. There were no predators that could take her down and no threats that she recognized as worth giving a damn about, all of which combined to mean that there wasn’t much that could distract her from the essential task of eating her way through the foliage of the world. All nine tons of her continued plodding relentlessly forward, her massive teeth stripping branches as she walked. Her grazing license typed her as a firebreak, preventing fires by clearing out all the dead stuff before it could go up. It was more than halfway true, and it hadn’t caught us any trouble yet.”