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

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

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.

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

Joel Sartore / Photo Ark / Bare-tailed woolly opossum (Caluromys philander) female sniffing and listening, Shell Factory Nature Park. Captive.

Christian Ziegler / Woolly Opossum (Caluromys philander) covered in Balsa Tree (Ochroma lagopus) pollen, Barro Colorado Island, Panama