The 'social intelligence hypothesis' was originally conceived to explain how primates may
have evolved their superior intellect and large brains when compared with other animals …

Intelligence is suggested to have evolved in primates in response to complexities in the
environment faced by their ancestors. Corvids, a large‐brained group of birds, have been …

Both humans and group-living animals associate and behave affiliatively more with some
individuals than others. Human friendship has long been acknowledged, and recently …

The aim of this study is to explain the occurrence of food sharing across primates. Defined
as the unresisted transfer of food, evolutionary hypotheses have to explain why possessors …

Recent work has shown that captive rooks, like chimpanzees and other primates, develop
cooperative alliances with their conspecifics. Furthermore, the pressures hypothesized to …

In the last decades, the assumption that complex social life is cognitively challenging, and
thus can drive mental evolution, has received much support from empirical studies in …

New Caledonian (NC) crows are the most sophisticated tool manufacturers other than
humans. The diversification and geographical distribution of their three Pandanus tool …

The last several decades of research on avian cognition have revealed surprising parallels
between the abilities of birds—most notably corvids—and great apes. Parrots, albeit far less …

To what extent do individuals assess the cognitive abilities of the opposite sex when
choosing a mate? With the exception of song learning in birds, the hypothesis that cognitive …

Social interactions are central to the health and psychological well-being of domestic
animals. Until now, research has overwhelmingly focused on negative social behaviours …