Wondiwoi tree-kangaroo

The Wondiwoi tree-kangaroo (Dendrolagus mayri) is a critically endangered, bear-like mammal native to tropical mountain forests on the island of New Guinea in Western Papua. Elusive and rare, it was considered extinct until rediscovery in 2018. It is a species of tree-kangaroo (genus Dendrolagus), a group of long-tailed, bear-like animals native to Australia and New Guinea that mostly live in trees and feed on plant matter. Tree-kangaroos belong to the macropod family (Macropodidae) with kangaroos, and carry their young in a pouch like most other marsupials. The Wondiwoi tree-kangaroo is likely threatened by hunting, and is known only from remote mountains on the Wondiwoi Peninsula in northwest New Guinea.

Until 2018, the wondiwoi tree-kangaroo was known only from a single specimen collected in 1928.

The only known specimen is a male weighing 9.25 kilograms (20.4 lb). D. mayri was located in the Wondiwoi Peninsula of West Papua at an elevation of 1,600 metres (5,200 ft) within montane rain forest. It is thought that the Wondiwoi tree-kangaroo could occupy an area of 300 square kilometres (120 sq mi). Re:wild, the global conservation organization, lists the Wondiwoi tree-kangaroo as one of their "25 most wanted lost species".