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When I think of China, I tend to imagine coastal China or the Yangtze River valley—which is to say areas of tremendous human population density where neighbor lives smashed up against neighbor and black smokestacks belch poison smoke onto the churning masses. Yet China is truly vast and parts of the nation are among the least densely populated places on Earth. The great northwest deserts of China are a land of shifting sands, xeric scrubland, and nothingness. Yet the dry wasteland is home to one of the world’s rarest and fanciest leaping rodents.
The Long-eared Jerboa, Euchoreutes naso, is an insect-eating, long-jumping, mouse-like creature which lives in the deserts of China and Mongolia. The animal’s habits are largely unknown–since it is a master of stealth and also since it lives in such an unforgiving and desolate regions where biologists are infrequent guests. The long-eared jerboa is sufficiently distinct that it is classified in its own genus and its own subfamily. It is (self-evidently) notable for its long ears which it uses to hunt insects in the desert nights and to avoid predators.
The animal is lightweight with a mass of only 24 g (0.85 oz) to 38 g (1.3 oz) and its body is small, measuring from 70 mm (2.8 in) to 90 mm (3.5 in)—although its tail is just as long as its body so the whole creature measures up to 180 mm long (7 inches) if you count the tail. Like other jerboas, this species probably excavate burrows where they rest during the day. Because they are so enigmatic and poorly understood (and also so endearing), the long-eared jerboas are a kind of symbol of truly wild creatures and the little rodent was identified as one of the top-10 “focal species” in 2007 by the Evolutionarily Distinct and Globally Endangered (EDGE) project.