Cage-cleaning: Interest or intrusion? (1996)

Chamove, A. S.

Abstract

After the woodchip litter was removed and replaced the animals' behavior was similar to that occurring during enrichment. It is likely that for arboreal monkeys, changes to their floor has no negative effect because the floor is a rarely-used part of their enclosure. Any changes to that area instead produce a welcome change [like an enrichment stimulus] in a little-changing routine.