1. Retreat space and human visitor density moderate undesirable behaviour in petting zoo animals;Anderson;JAAWS,2002
2. Benefits of positive human interaction for socially housed chimpanzees;Baker;Anim Welf,2004
3. Frequency of feeding enrichment and response of laboratory nonhuman primates to unfamiliar people;Baker;J Am Ass Lab Anim Sci,2006
4. Effects of browse, human visitors and noise on the behaviour of captive orang utans;Birke;Anim Welf,2002