Venado cola blanca (Odocoileus virginianus) y cérvidos exóticos, en un sitio de la sierra nevada, Puebla, México

The introduction of exotic species is considered as an important factor that provokes the extinction or decline of population. An estimation of the population density of white-tailed deer, that is native in the area, is being carried out in the present work, also are included four species of exotic deer that were introduced for hunting in a Unit Management and Sustainable Use of Wildlife, it is located in the Sierra Nevada of Puebla, Mexico. Two techniques were used, an indirect by means of feces by the Eberhardt and Van Etten method, and other direct through sightings of individuals, making use of computer program Distance. The results of first method indicate a total density of Ninety-nine individuals and the second one show a hundred and sixty-nine individuals. The result by indirect method was chosen as the most reliable technique due to statistical issues; as well as effective sampling  excreta,  besides  the  population  of  deer  is  not  overestimate.  The  ecological damages  that  could  be  caused  by the  presence  of exotic deer are discussed and  it  is suggested to remove them from the area.