Prohesperocyon – the first known canid – was a small, omnivorous creature in a forest of astonishing giants, a natural neighbour to the likes of the fearsome Nimravidae, sabre-toothed carnivores resembling great cats. As Earth gradually cooled and dried and the dense jungles were replaced by extensive grasslands, the elongated legs and long strides of the canid body shape clearly provided an advantage in long distance chases. Canidae thrived.
