SOUTHERN BLACK-EARED OPOSSUM Didelphis aurita 
Smith P 2009 - FAUNA Paraguay Handbook of the Mammals of Paraguay Number 33 Southern Black-eared Opossum Didelphis aurita
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A large opossum, the Southern Black-eared can be easily distinguished from the more widespread White-eared Opossum by, you guessed the colour of the ears! Of course thats not the only way to tell them apart, they are actually quite different beasts, but they share a similar semi-arboreal lifestyle and omnivorous diet. This species however is far more closely tied to forest environments than its more adaptable relative.
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FIGURE 1 - (FPMAM11PH) Adult, Kuruguaty, Departamento Canindeyú (Philip Myers undated).
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LINKS TO DOWNLOADABLE OPEN ACCESS REFERENCES USED IN THE PREPARATION OF THE FAUNA PARAGUAY HANDBOOK OF THE MAMMALS OF PARAGUAY SPECIES ACCOUNT FOR THIS SPECIES:

Allen JA 1902 - A Preliminary Study of the South American Opossums of the Genus Didelphis - Bulletin AMNH 16: p149-188.
Astúa de Morães D, Moura RT, Grelle CEV, Fonseca MT 2006 - Influence of Baits, Trap Type and Position for Small Mammal Capture in a Brazilian Lowland Atlantic Forest - Bol. Mus. Biol. Mello. Leitão 19: p19-32.
Brown BE 2004 - Atlas of New World Marsupials - Fieldiana Zoology 102.
Cáceres N 2003 - Use of the Space by the Opossum Didelphis aurita Wied-Neuwied (Mammalia Marsupialia) in a Mixed Forest Fragment of Southern Brazil - Revista Brasileira de Zoologia 20: p315-322.

Cáceres NC, Monteiro Filho EL de A 1999 - Tamanho Corporal em Populacões Naturais de Didelphis (Mammalia: Marsupialia) do Sul do Brasil - Revista Brasileira de Biologia 57: p461-469.
Cáceres NC, Monteiro-Filho EL de A 2007 - Germination in Seed Species Ingested by Opossums: Implications for Seed Dispersal and Forest Conservation - Brazilian Archives of Biology and Technology 50: p921-928.
Carvalho FMV de, Delciellos AC, Vieira MV 2000 - Medidas Externas dos Miembros de Marsupiais Didelfidios: Uma Comparação com Medidas do Esqueleto Pós-Craniano - Boletim do Museu Nacional, Rio de Janeiro 438.
Carvalho FMV de, Pinheiro PS, Fernández FAS, Nessimian JL 1999 - Diet of Small Mammals in Atlantic Forest in Southeastern Brazil - Revista Brasileira de Zoociencias 1: p91-101.
Ceotto P, Finotti F, Santori R, Cerqueira R 2009 - Diet Variation of the Marsupials Didelphis aurita and Philander frenatus (Didelphimorphia: Didelphidae) in a Rural Area of Rio de Janeiro State, Brazil - Mastozoologia Neotropical 16.
Cunha AA, Vieira MV 2002 - Support Diameter, Incline and Vertical Movements of Four Didelphid Marsupials in the Atlantic Forest of Brazil - Journal of Zoological Society of London 258: p419-426.
Cunha AA, Vieira MV 2005 - Age, Season and Arboreal Movements of the Opossum Didelphis aurita in an Atlantic Rainforest of Brazil - Acta Theriologica 50: p551-560.
Delciellos AC, Vieira MV 2006 - Arboreal Walking Performance in Seven Didelphid Marsupials as an Aspect of Their Fundamental Niche - Austral Ecology 31: p449-457.
Delciellos AC, Vieira MV 2007 - Stride Lengths and Frequencies of Arboreal Walking in Seven Species of Didelphid Marsupials - Acta Theriologica 52: p101-111.
Delciellos AC, Vieira MV 2009 - Allometric, Phylogenetic and Adaptive Components of Climbing Performance in Seven Species of Didelphid Marsupials - Journal of Mammalogy 90: p104-113.

Kajin M, Cerqueira R,Vieira MV, Gentile R 2008 - Nine Year Demography of the Black-eared Opossum Didelphis aurita (Didelphimorphia: Didelphidae) Using Life Tables - Revista Brasileira de Zoologia 25: p206-213.  
Lima SF, Obara AT 2004 - Levantamento de Animais Silvestres Atropelados na BR-277 às Margens do Parque Nacional do Iguaçu - Subsídios ao Programa Multidisciplinar de Proteção à Fauna.
Loretto D, Vieira MV 2005 - The Effects of Reproductive and Climatic Seasons on Movements in the Black-eared Opossum (Didelphis aurita Wied-Neuwied 1826) - Journal of Mammalogy 86: p287-293.
Mendel SM, Vieira MV, Cerqueira R 2008 - Precipitation, Litterfall and the Dynamics of Density and Biomass in the Black-eared Opossum Didelphis aurita - Journal of Mammalogy 89: p159-167.
Moura MC, Caparelli AC, Freitas SR, Vieira MV 2005 - Scale Dependent Habitat Selection in Three Didelphid Marsupials Using the Spool-and-line Technique in the Atlantic Forest of Brazil - Journal of Tropical Ecology 21: p337-342.
Moura MC, Cerqueira R, Vieira MV 2009 - Occasional Intraguild Predation Structuring Small Mammal Assemblages: The Marsupial Didelphis aurita in the Atlantic Forest of Brazil - Austral Ecology IN PRESS

Myers P, Espinosa R, Parr CS, Jones T, Hammond GS, Dewey A 2006 - The Animal Diversity Web (online). Accessed December 2007.

Vieira MV 1997 - Body Size and Form in Two Neotropical Marsupials, Didelphis aurita and Philander opossum (Marsupialia: Didelphidae) - Mammalia 61: p245-254.
Vieira MV, Cunha AdeA 2008 - Scaling Body Mass and Use of Space in Three Species of Marsupials in the Atlantic Forest of Brazil - Austral Ecology 33: p872-879.
CLICK THE HANDBOOK LINK ABOVE TO DOWNLOAD OTHER PDFS OF THE SPECIES ACCOUNTS FOR THE FAUNA PARAGUAY HANDBOOK OF PARAGUAYAN MAMMALS VOLUME 1: DIDELPHIMORPHIA.