Cages are used as an alternative to tethering, these coming in many different forms and sizes. Very often these cages are locked away within dark outhouses to avoid detection by the authorities. Sometimes the primates we rescue have actually been chained up within their cage. Others we have found chained up inside derelict vehicles which serve as their cage. These primates are isolated from the outside world, kept in cramped dark conditions, with little or no social interaction with their 'owners'. Once caged the monkey is confined there for life - unless we are tipped off and rescue them.