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From July 1998 to July 2000 we collected individuals. Three models of ocelot distribution in Sonora, based on vegetation types, the GARP modelling system locality information and habitat associations for 36 records of the Endangered ocelot Leopardus pardalis in and the Adaptive Kernel home range estimator, all produced similar results, with the ocelot mostly associated the Mexican State of Sonora. Twenty-seven (75%) of the records for which we could determine the biotic with the mountainous Sierra region of eastern Sonora. Large tracts of land with a low human population community association were associated with tropical and subtropical habitats, namely subtropical thornscrub, density make Sonora a stronghold for the northernmost distribution of ocelots. tropical deciduous forest or tropical thornscrub. Only males (11.1% of the total records) have been recorded in temperate oak and pine-oak woodland, and we con-

Given the conflict with human interests that in many cases results in the extirpation of large carnivores, acceptance of their reintroduction is a considerable challenge. By the 1980s Mexican wolves ( Canis lupus ) were extinct in the wild. In 1998 a population was reintroduced in the Blue Range Mountains of New Mexico (U.S.A.). Efforts to reintroduce the species in