Lemurs’ group size predicts social intelligence
Primates that live with many others know not to steal food when someone is watching
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2013/06/cg_58152_feat.jpg?fit=860%2C460&ssl=1)
Ring-tailed lemurs like those pictured were less likely to steal food with a human watching than were lemurs that live in smaller groups.
Tony Camacho/Science Source