Argentina Buenos Aires [Argentina] 443 South America 208 Buenos Aires 98 article 77 Animals 48 Atlantic Ocean 44 abundance 40 rodent 40 Mar del Plata 38 urban area 37 Rodentia 36 Western Hemisphere 36 World 36 Pampas 33 nonhuman 33 Rio de la Plata 32 morphology 31 seasonal variation 29 Gondwana 28 animal 27 Aves 26 concentration (composition) 26 Buenos Aires Province 23 Buenos Aires [Federal District] 23 Federal District [Argentina] 23 Rivers 23 controlled study 23 Animalia 21 Female 21