Anderson's mouse opossum  (Marmosa andersoni)

Arboreal: An animal which lives or spends a large amount of time in trees.
Gestation: The state of being pregnant; the period from conception to birth.
Insectivorous: Feeding on insects.
Mammae: An organ of female mammals that contains milk-producing glands, a mammary gland.
Marsupial: A diverse group of mammals characterised by their reproduction, in which gestation is very short, and the female typically has a pouch (marsupiam) in which the young are raised. When born, the tiny young crawls to the mother's teats, where it attaches and stays for a variable amount of time, whilst it continues to develop. Marsupials also differ from placental mammals in their dentition.
Nocturnal: Active at night.
Opposable: Referring to a digit, (thumb or toe), that can be turned so that its pad makes contact with the pad of each of the other digits on the same limb.

1. IUCN Red List (September, 2007)
   http://www.iucnredlist.org
   
2. Solari, S. and Pine, R.H. (2008) Rediscovery and redescription of Marmosa (Stegomarmosa) andersoni Pine (Mammalia: Didelphimorphia: Didelphidae), an endemic Peruvian mouse opossum, with a reassessment of its affinities. Zootaxa, 1756: 49 - 61.
   
3. Pine, R.H. (1972) A new subgenus and species of Murine opossum (Genus Marmosa) from Peru. Journal of Mammalogy, 53: 279 - 282.
   
4. Alonso, A., Dallmeier, F. and Campbell, P. (2001) Urubamba: The Biodiversity of a Peruvian Rainforest, SI/MAB Series 7. Smithsonian Institution, Washington, DC.
   
5. Macdonald, D.W. (2006) The Encyclopedia of Mammals. Oxford University Press, Oxford.
   
6. O'Connell, M.A. (1983) Marmosa robinsoni. Mammalian Species, 203: 1 - 6.
   
7. EDGE of Existence (October, 2007)
   http://www.edgeofexistence.org/mammals/species_info.php?id=26