BUTEO SWAINSONI AGUILUCHO LANGOSTERO 6 MIGRACION 4 MIGRATION 4 SWAINSON’S HAWK 4 ABUNDANCE 2 AGRICULTURE 2 AGROECOSISTEMAS 2 AGROECOSYSTEMS 2 AREA DE DISTRIBUCION AUSTRAL 2 AYUNO 2 BEHAVIOR 2 BODY MASS 2 CATERPILLARS 2 CONSERVACION 2 CONSERVATION 2 DIET 2 DIETA 2 FASTING 2 GRASSHOPPERS 2 GRASSLANDS 2 MASSIVE MORTALITIES 2 MORTALIDADES MASIVAS 2 ORUGAS 2 PASTIZALES 2 PESO CORPORAL 2 SWAINSON'S HAWK 2 TUCURAS 2 WINTERING GROUNDS 2 ABUNDANCIA 1