The Elusive Tree Kangaroo - Dendrolagus. A close relative of the more recognized terrestrial kangaroo of Australia, there are 14 known species dwelling in parts of Papua New Guinea, Indonesia, and Australia. They are a rare bunch, and most of them are threatened. Author Matthew Power followed geologist and avid caver John Lane on a quest to find one on a remote island in Papua New Guinea. Read all about it in our latest story, Island of Secrets.