Otarocyon
Otarocyon ("large eared dog") is an extinct genus of the Borophaginae subfamily of canids native to North America. It lived during the Oligocene epoch, about 33.3—20.6 Ma (million years ago). Fossils have been found only in Montana, Wyoming, and South Dakota. "Otarocyon" was a small borophagine characterized by a short, broad skull, a specialized middle ear, simple, tall premolar teeth, and molars that are incipiently adapted to a hypocarnivorous diet. Despite its Oligocene age, the skull of "Otarocyon" shows several striking similarities to the living fennec fox, particularly in the structure of its middle ear. The similarities are probably  convergent, but they suggest that "Otarocyon" may have been similar in its appearance and habits. Species. In addition to its earlier age, "O. macdonaldi" differs from "O. cooki" in being smaller and in showing lesser development of the specializations that characterize the genus. "O. macdonaldi" is also the earliest known member of the subfamily Borophaginae, although the later appearing "Archaeocyon" was more primitive.