Claudio Contreras / Gray four-eyed opossum (Philander opossum), Catemaco Lake, Los Tuxtlas Biosphere Reserve, Mexico, July

Pete Oxford / Woolly Opossum (Caluromys philander) young in defensive display, Rupununi, Guyana

Pete Oxford / Woolly Opossum (Caluromys philander) young, Rupununi, Guyana

Nick Gordon / Bare tailed woolly opossum (Caluromys philander) investigating (Naucleopsis) fruit at night in forest, Amazonia, Brazil

Nick Gordon / Bare tailed woolly opossum (Caluromys philander) at night, Amazonia, Brazil

Nick Gordon / Bare tailed wooly opossum (Caluromys philander) investigating (Naucleopsis) fruit at night in forest, Amazonia, Brazil

Luiz Claudio Marigo / Bare tailed woolly opossum {Caluromys philander} tropical rainforest, Brazil

Michael & Patricia Fogden / Grey Four-eyed Opossum (Philander opossum) in the Amazon rainforest, Ecuador

Mark Moffett / Woolly Opossum (Caluromys philander) is well adapted to canopy life with gripping hands, Costa Rica

Sean Crane / Grey Four-eyed Opossum (Philander opossum) young at night, Soberania National Park, Panama

Roland Seitre / Bare-tailed woolly opossum (Caluromys philander) captive, Australia.

Roland Seitre / Bare-tailed woolly opossum (Caluromys philander) hanging from branch with tail, captive, Australia.