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Robust cottontail
The robust cottontail or Davis Mountains cottontail (''Sylvilagus robustus'') is a species of cottontail rabbit endemic to four mountain ranges in the southwestern United States and adjacent Mexico. It was long considered to be a subspecies of the eastern cottontail (''S. floridanus''), but has recently been promoted to species level due to morphological analysis. Genetic data have confirmed the uniqueness of ''S. robustus''. ''S. robustus'' and the subspecies of ''S. floridanus'' are distinguished primarily by size, dental, and cranial differences. These rabbits typically average a total length of 42 cm, and weigh between 1.3 and 1.8 kg.〔 This species is restricted to dry, brushy, mountains at elevations above 1500 meters.〔(The mammals of Texas: 2nd edition ) By David J. Schmidly, William B. Davis. 2004. pp. 466-467. University of Texas Press.〕 Despite its rarity, currently no governmental agency provides protection or listing for this species.〔
==Range==
Historically, this species was known to be endemic to four mountain ranges. In Texas it was known in the Guadalupe Mountains, Davis Mountains and Chisos Mountains. In New Mexico it was known from the Guadalupe Mountains. And in Coahuila, Mexico it is known from the Sierra de la Madera. The Chisos and Guadalupe Mountains populations are believed to be extirpated.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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