Guest editor: Joel D. Levine, Daniel J. C. Kronauer, Michael H. Dickinson
January 1, 2017; 220 (1)
Cover: Division of labour is a fundamental aspect of insect societies and other social systems. In colonies of the clonal raider ant Ooceraea biroi, for example, some worker ants form a tight nest cluster where the larvae are nursed, while others leave the nest to explore and forage for food. Each ant in this picture is tagged with two colour dots to facilitate individual behavioural observations. This Special Issue integrates recent research on the ultimate and proximate underpinnings of social behaviour across a wide range of biological systems (Kronauer and Levine, pp. 4–5). Photo: Daniel Kronauer.