Focus 

Focus on Cooperation

Cooperation has been the key to success for many of Earth's species, from microbiota to humans. Despite the centrality of cooperation to so many liveways, there is still a great deal to be understood about its evolution and how and when it succeeds and fails. This collection pulls together content from the Nature Human Behaviour Focus issue on Cooperation - including insights from anthropology, evolutionary biology, human behavioural ecology, economics, neuroscience, psychology, ethology, and environmental studies - and from the archive of Nature Ecology & Evolution, to understand the state of knowledge on cooperation and highlight future research directions.