What is a place that only has one animal animal population in it.

Found only in the cloud forest of Papua New Guinea's Huon Peninsula, the Matschies tree Kangaroo, Dendrolagus matshiei, is a plush brown marsupial with golden paws, belly, and tail that spends most of its life in the treetops munching leaves.

Like other Kangaroos, female Matschie's tree kangaroos carry and nurse their joeys in a pouch.

My most favourite is the Rare pink Iguana (Conolopgus Marthae) of the Galapagos Islands.