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Mole rats are afraid to leave their burrows. Like periscopes, they scan for danger as they feed. Sometimes with the help of watchful hill chats gathering insects from around the rats' dung piles. Even so, mole rats are up against an expert. The alarm goes off, but the wolf is patient. There is no shortage of food up here. "Rat infested" hardly begins to describe a place where there are 2 tons of rats to each square kilometer. At the den, the pups eagerly anticipate the returning adults. The hunters are endlessly mobbed until they cough up the goods.

This might seem like wolf paradise, but these specialized mountain predators face an uncertain future. The cold alpine tundra on which their ancestors evolved and on which these wolves now entirely depend is ever so slowly vanishing. The African climate is getting warmer, the Ethiopian highlands steadily wearing away. The remaining 1000 wolves are truly marooned on the Roof of Africa.

mole n.   鼹鼠

periscope n.  Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.

潜望镜：一种管状镜，包含折射物，如镜子和棱镜，用以观察与视线不在同一直线上的位置
infest vt. (~ed. adj.)  To inhabit or overrun in numbers large enough to be harmful, threatening, or obnoxious:

（害虫、盗贼等）大批出没于：大量地居住或出没于，数量大到有害、有威胁性或有毒的程度
cough up vt. 咳出

wear away vt.  消逝, 衰退
maroon vt.    To put ashore on a deserted island or coast and intentionally abandon.

放逐：将…置于一个荒凉的岛上或海岸边并有意抛弃