 Reference Base  Influence of zoo visitors on behaviour and salivary stres... |
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 | Kalthoff, A. et al., 2000. Influence of zoo visitors on behaviour and salivary stress-hormone concentrations in white rhinos (Ceratotherium simum simum). Proceedings 17th Ethologentreffen, 14-18 August 2000, Utrecht 17: 73
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