Nonhuman primates in captivity have been maintained in varied
housing conditions. Animals have been housed for many years in
research facilities in individual cages that can be easily
sanitized and placed in climate-controlled rooms. Indoor-outdoor
runs have been used as primary housing, usually with the indoor
portion engineered to protect the animals from environmental
extremes (NRC 1996). Heavy-wire units originally built to store
corn and often referred to as corn cribs and corrals with areas
of 0.1–3.0 hectares (0.2–7.4 acres) have been used as outdoor
housing. Some corrals contain structures to protect the animals
from the elements; others are connected to structures that
provide shelter and are used to capture the animals. Nonhuman
primates have also been maintained on islands, some with areas
of over 175 hectares (430 acres). Each form of housing has
advantages and disadvantages.  The acceptable temperature range
for primates adapted to the outdoors varies greatly. Some
species, such as savanna baboon