Initial response to introduction of a PVC perch by singly caged Macaca fascicularis (1993)

Shimoji, M., Bowers, C. L., Crockett, C. M.

Abstract

Longtailed macaques ... exhibit a vertical flight response when alarmed. Therefore, the height of the cage is important for allowing the animals to withdraw from potentially stressful or alarming situations. ..Single-housed monkeys spent significantly more time clinging to the cage wall ( suspended ) in the absence of the perch. ... Monkeys in lower level cages [26% of daytime] averaged somewhat more time on the perch than those in upper cages [14% of daytime]. ... There was less stereotypy when the perch was present.