Variegated spider monkey  (Ateles hybridus)

Arboreal: Living in trees.
Diurnal: Active during the day.
Endemic: A species or taxonomic group that is only found in one particular country or geographic area.
Gestation: The state of being pregnant; the period from conception to birth.
Prehensile: Capable of grasping.
Sternal glands: Gland located near the sternum.
Subspecies: A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.

1. IUCN Red List (September, 2008)
   http://www.iucnredlist.org/
   
2. Richardson, M. (2006) Pers. Comm.
   
3. Zoo school (September, 2008)
   http://www.zooschool.ecsd.net/spider%20monkey.htm
   
4. Primates in Peril: The World's 25 Most Endangered Primates 2006 – 2008 (September, 2008)
   http://www.primate-sg.org/PDF/Primates.in.Peril.2006-2008.v2.pdf