My interests are focused on ecological niche (habitat selection and resource partitioning), and its implication for species coexistence. I usually use vertebrates as models for my research, with an especial focus on steppe and farmland birds (in Spain) and wild and domestic ungulates (in South America). In the last years I am also interested in other kind of interspecific relationships, especially predation by puma. In my early years I used to study structure and dynamics of plant communities.