Goodfellow's tree kangaroo  (Dendrolagus goodfellowi)

Arboreal: Living in trees.
Marsupial: A diverse group of mammals characterised by their reproduction. The embryo is born 11-45 days after conception. The tiny neonate crawls into the marsupium (pouch) and attaches to a teat where it stays for a variable amount of time. They also differ from placental mammals in their dentition.
Nocturnal: Active at night.
Sacculated: Formed with or having saclike expansions.

1. IUCN Red List (June, 2009)
   http://www.redlist.org
   
2. Discovery: Animal Planet (February, 2006)
   http://animal.discovery.com/guides/mammals/habitat/tropforest/goodkanga.html
   
3. Animal Diversity Web (February, 2006)
   http://animaldiversity.ummz.umich.edu/site/
   
4. WWF: Forests of New Guinea (February, 2006)
   http://www.worldwildlife.org/expeditions/newguinea/spec_tk.cfm
   
5. Animals: The Animal Information Centre (February, 2006)
   http://www.angelfire.com/mo2/animals1/kangaroo/goodfellow.html
   
6. Animal Info - Information on Endangered Mammals (February, 2006)
   http://www.animalinfo.org/species/dendgood.htm