Perch use by Macaca mulatta in relation to cage location (1991)

Woodbeck, T., Reinhardt, V.

Abstract

Single-housed animals living in lower-row cages spent an average of 31.6% of the time perching on their pipes while animals living in upper-row cages perched only 6.9% of the time. Access to the vertical dimension of the cage was more important for the lower-row caged monkeys who continuously live close to the ground, in the horizontal dimension of the room.