Living continuously with a compatible companion is not a distressing experience for rhesus monkeys (1990)

Reinhardt, V., Cowley, D., Scheffler, J. et al.

Abstract

Paired females had serum cortisol concentrations that did not differ from single-housed females. Dominant animals had cortisol concentrations that did not differ from those of their subordinate companions, indicating that neither dominant nor subordinate partners experienced social distress.