The interaction rules that govern coordination and collective decision-making in animal groups represent a burgeoning area of research. Advances in tracking technology are enabling us to elucidate in unprecedented detail the mechanisms involved, the role of inter-individual differences in shaping group behavior, as well as the consequences that such differences have for both groups and individuals. Focusing on my research group's work with birds, in this talk I will discuss how leaders and followers can spontaneously emerge in groups, how groups benefit when multiple individuals contribute to decisions (i.e. collective intelligence, and how learning while acting collectively with others can allow knowledge to accumulate in groups (i.e. cumulative intelligence in ways that satisfy criteria for cumulative culture.