Nick Hawkins / Woolly opossum (Caluromys derbianus) Nicoya Peninsula, Costa Rica. January 2015.

Roland Seitre / Derby's woolly opossum (Caluromys derbianus) portrait, captive, Aviarios del Caribe, Cahuita, Costa Rica.

Roland Seitre / Derby's woolly opossum (Caluromys derbianus) portrait, captive, Aviarios del Caribe, Cahuita, Costa Rica.

Roland Seitre / Derby's woolly opossum (Caluromys derbianus) El Paujil ProAves reserve, Puerto Pinzon, Puerto Boyaca, Columbia.

Konrad Wothe / Woolly Opossum (Caluromys derbianus) in lowland rainforest, Braulio Carrillo National Park, Costa Rica

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

Pete Oxford / Wild Western Woolly opossum {Caluromys lanatus} Amazon, South America

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.