Fecal Nitrogen Concentration as a Nutritional Quality Indicator for European Rabbit Ecological Studies - Gil-Jiménez, Esperanza (CSIC. Department of Conservation Biology, Estación Biológica) ; Villamuelas, Miriam (University of Padova. Department of Agronomy. Food, Natural Resources) ; Serrano Ferron, Emmanuel (Universidade de Aveiro. Departamento de Biologia) ; Delibes, Miguel (CSIC. Department of Conservation Biology, Estación Biológica) ; Fernández, Néstor (Consejo Superior de Investigaciones Científicas. Department of Conservation Biology)