Neotropical mammals of medium-large size still are poorly studied. In the Amazonia the gaps in the scientific knowledge on this group occur mainly for the difficulty of accomplishment of more complete studies during short periods of time and limited financial resources. To minimize these problems, indirect methods to study them have been used as an alternative to the traditional methods and therefore they had been applied in this work. With the intention to detect how the local community of medium-large size mammals makes use the habitats, comparing the frequency of the use of different vegetation formations reached by the means of count tracks, 1 intended to contribute for the conservation and identification of areas of high biological value for the studied species. The wealth of species and the relative frequency of habitat use had been analyzed of comparative form between White-Sand Vegetation (Campina), Open Arboreal Savannah (Campo Cerrado), Dense Arboreal Savannah (Cerradão) and Forest habitats (Floresta Ombrófila) through three visits to the study area. 1 registered 33 species, distributed in 8 orders, 18 families and 29 genera. The vegetation formations in the study area had not differed in terms of the species presence, with exception of the primate fauna, which is particular of forest formations. However, with relation to the habitat use, distinct trends in the frequency of use of each vegetation formation for the different species had been demonstrated. The majority of species registered for the method of detention of tracks seems to suffer the effect from seasonal variation of the rain regimen. Moreover they seem to depend more on the forest formations. This is clearly when it is demonstrated to a bigger diversity and use of forest habitats by the studied species. However, with exception of arboreal species, they are versatile in the occupation of the different types of habitats. Thus, Serra do Cachimbo presents rich and diversified fauna perhaps due the fact of this region to present distinct vegetational elements, favoring species with preferences for savanoid and forest formations.
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