At the edge of a sprawling grassland, a pair of hoofed grazers resembling horses, an antelopelike notoungulate and a ground sloth feed quietly, oblivious to their impending doom.

原的边缘，有一对貌似马儿的有蹄食动、一只很像羚羊的南方有蹄类和一只地獭觅食，没有注意到大祸即将临头。