Cohen, J. 1998. Training rhesus macaques for the pole and collar system. Primate Enrichment Forum (PEF, March 9, 1998) .

I trained two [adult] male Rhesus over the past year with the pole and collar system and neither of them need the squeeze mechanism to hook their collar. One of them sits still and waits for me to hook his collar and the other runs to the front of the cage and hands his collar ring to me.