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Range DescriptionSylvilagus insonus is restricted in range to the Sierra Madre del Sur, near Omiltemi, in Guerrero, Mexico (Chapman and Ceballos 1990). Records of S. insonus show an elevational range of 2,133-3,048 m (Cervantes and Lorenzo 1997). The species is known from the type locality only (Cervantes and Lorenzo 1997). S. insonus occupies a highly fragmented area of less than 500 km (Cervantes et al. 2004).