In the highlands, the Ethiopian wolf’s staple diet is rodents. "Dogs in the Wild: Secrets of Success" premieres Wednesday, February 15 at 8/7c on PBS. [VID: Here in the highlands, the wolf's staple diet is rodents. They are everywhere. Grass rats make a tasty meal, but they live in a colony and are hyper-vigilant. An easier meal can be found in the bigger, juicier giant mole rat. Living alone, these unusual-looking rodents rarely stray far from the safety of their burrows. The wolves employ a ra