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1 Appendix B > MAMMALS Dwarf Shrew (Sorex nanu5) The dwarf shrew typically occurs in isolated, relic populations in rock slide areas or on talus slopes. It is less commonly found at lower elevations in sedge marshes, alkaline sage flats, shortgrass prairie, and pinyon-juniper. No known records from the Forest. Marten (Marte5 americana) The marten prefers dense, mixed-deciduous or mature-coniferous forest, Martens use ground burrows, rock piles and crevices, hollow trees. stumps, do~nfalls and brush which provide refuge and winter access to sub-snow vegetation galleries and rodent prey, Martens are active both on the ground and in the trees, but are rarely seen, even where fairly common, Habitat selection depends on abundance of available prey. Martens eat many items, including voles, squirrels, chipmunks, shrews, hares carrion. and occasionally insects, berries, and birds. Have been seen throughout the Forest. North American Lynx (Feli5lynx caraelen5i5) The lynx is found in dense coniferous forest between 9,00o..foot elevation and timberline. Lynx are primarily found in the subalpine forest ecosystem in Colorado. although they may occur in upper reaches of the Douglas-fir ecosystem. Young are born in dens usually located in caves or rock crevices, or in hollow logs. Lynx require dense forest cover as protection against enemies, When disturbed, lynx will take refuge in a tree or underground cavities. They prefer north-facing slopes with dense spruce-fir forest interspersed with rocky outcrops and caves. A minimum habitat depending on the prey base. No recent records on this Forest, In the mid-' 980's, Dr. Halfpenny (CSU) found a track over on the East Fork. of the San Juan River. North American Wolverine (Gulo gulo IU6CU5) Wolverines are found primarily in upper montane ecosystems including Douglas-fir, mixed conifer and lodgepole pine ecotypes, and alpine or marshy areas, Wolverines are opportunistic feeders. They are both carrion feeders and predatory depending on topography and weather factors, Wolverines maintain food caches throughout their range which are marked with scent, urine or both. Territories may be quite large and size may be determined by food supply and availability of denning sites, Wolverines are adapted to travel in areas with snow and have been associated with big-game migration to winter range (probably due to the abundant food source). They have shown a preference to alpine and high-elevation riparian or marshy areas, They are primarily solitary animals which travel great distances and, do not tolerate human disturbance. No known records from the Forest. 8-' (,~ 2518