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Species have complex relationships with others in the wild, and some such as capuchin ( Sapajus apella ) and squirrel monkeys ( Saimiri sciureus ) naturally choose to associate with each other. There are a number of benefits of exhibiting such species in correspondingly mixed communities in captivity to enhance welfare through increased social complexity, which is potentially environmentally enriching in restricted captive enclosures. Monitoring the interactions between species is critical, however, particularly when members of one species are considerably larger and potentially more aggressive than the other. We report on the frequency and nature of interspecific interactions between S. apella and S. sciureus during four time periods over 3 years (2008–2010) following the formation of two mixed species groups at the ‘Living Links to Human Evolution' Research Centre in Edinburgh Zoo, Scotland. Both the rate and the distribution of interspecific interactions among aggressive, affiliative and neutral categories of behaviour varied over time ( P S. apella would engage in more interspecific, particularly aggressive, interactions than S. sciureus than vice versa, as they are the larger, more social species and have a more pugnacious temperament. This was the case overall ( P |
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