It is now known that intelligent primates are characterised by a longer lifespan

As part of the research, the experts conducted a series of six tests on 198 lemurs over several years. Four of the tests determined the primates’ cognitive abilities, in particular their ability to cope with unusual tasks, spatial memory, self-control and the ability to understand cause-and-effect relationships, while two others were conducted to determine each primate’s level of curiosity and exploratory behaviour.