the Rhesus Macaque: a monkey species with high similarities to humans. Rhesus Macaque have been used in psychological research because of their complex cognitive-behavioural abilities including the capability of understanding rules, looking after their own mental state, making judgements and their capacity to inhabit in groups and individually, like humans do. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.