Changes in activity levels of singly housed longtailed macaques when given the opportunity to exercise in a larger cage (1993)

Leu, M., Crockett, C. M., Bowers, C. L. et al.

Abstract

Over a period of 36 days, each [single-housed] animal had 15 min per day access to a multicompartmental [large] exercise cage. Locomotion increased while stereotypical behavior decreased when the animals were in the exercise cage.