Forest fragmentation often acts to subdivide some animal populations, but can create new habitats and increase heterogeneity that may aid others. We evaluated the use of forest-pine plantation edge, forest interior, and forest-grassland edge in an Andean forest fragment by the lined quail-dove, Zentrygon linearis, rodents, and the Andean white-eared opossum, Didelphis pernigra. We compared the ... [Show full abstract] number of visits to and corn seeds consumed from artificial food patches at each site. We included in the analyses possible effects of rainfall and illumination of the moon. Zentrygon linearis preferred the forest interior, whereas night-active rodents and marsupials preferred forest-pine plantation edge and forest-grassland edge, respectively. Moonlight illumination affected the behavior of mammals depending on the site, whereas rainfall did not affect habitat use. Our results suggest that habitat selection by the three species was affected by edge effects. Doves and rodents both feed upon seeds separated both in space and time, suggesting that avoiding each other favors their coexistence. Also, habitat selection by these species may help them avoid opossums (known for preying upon small vertebrates) or other potential predators. Thus, we hypothesize that both competition and predation are modulated by human-created edges, affecting habitat use by seed-eating species and favoring their coexistence in Andean landscapes. Finally, our study shows how behavioral indicators can help us understand the responses of wildlife to human modifications of the landscape in the Colombian Andes.