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Thomasomys ucucha is a rodent in the family Cricetidae. Found only in the Cordillera Oriental mountain range of Ecuador (map shown), it is known from forests and grasslands from 3,380 to 3,720 meters (11,090 to 12,200 ft) above sea level. It may share its habitat with seven other species of Thomasomys. First collected in 1903 and formally described as a new species in 2003, T. ucucha most closely resembles the woodland Oldfield mouse, which occurs further to the north. Medium-sized, dark-furred, and long-tailed, T. ucucha can be distinguished from other species of Thomasomys by its large, broad, procumbent upper incisors. Head-and-body length is 94 to 119 mm (3.7 to 4.7 in), and body mass is 24 to 46 grams (0.85 to 1.62 oz). The front part of the skull is flat, short, and broad. The incisive foramina, openings at the front of the palate, are short, and the palate itself is broad and smooth. It is listed as a vulnerable species due to the threat of habitat destruction. (Full article...)