How are the monkeys housed? 

The Center's objective is to provide social interaction for all monkeys, except when concerns about monkey health and well-being or experimental needs would make group or paired-caging impossible.

OHSU/ONPRC pioneered social housing of primates in the 1970s, when it constructed several 1-acre, outdoor corrals for groups of 80-100 monkeys.
In the mid-1990s, after completing a 10-year project of creating a pathogen-free colony of monkeys that is unmatched anywhere in the world (a project that required single caging of much of its colony), the OHSU/ONPRC initiated efforts to increase social housing. Since 1996, it has undertaken an ambitious program of constructing new group housing facilities. At the same time, it began converting existing single cages to pair cages and training a large number of singly caged monkeys to live compatibly with companions. In 1998, the Center began drawing up plans for outdoor sheltered group housing. At a cost of more than $5.5 million, 20 of these new units came on line in September 2001. We now have a total 32 outdoor sheltered housing units.