The paper by Couzin et al. explores effective leadership and decision-making in animal groups, particularly in the context of foraging and migration. The authors use a simple model to demonstrate how information can be transferred within groups, even without signaling, and when group members do not know which individuals have information. They find that larger groups require a smaller proportion of informed individuals to guide the group effectively, and that only a small fraction of informed individuals is needed to achieve high accuracy. The model also shows how groups can make consensus decisions, even when informed individuals differ in their preferences. The study highlights the importance of social interactions and the ability of individuals to respond to those with information, providing insights into the mechanisms of effective leadership and decision-making in biological systems. The findings suggest that leadership can emerge based on information differences among group members, without the need for explicit signaling or complex mechanisms.The paper by Couzin et al. explores effective leadership and decision-making in animal groups, particularly in the context of foraging and migration. The authors use a simple model to demonstrate how information can be transferred within groups, even without signaling, and when group members do not know which individuals have information. They find that larger groups require a smaller proportion of informed individuals to guide the group effectively, and that only a small fraction of informed individuals is needed to achieve high accuracy. The model also shows how groups can make consensus decisions, even when informed individuals differ in their preferences. The study highlights the importance of social interactions and the ability of individuals to respond to those with information, providing insights into the mechanisms of effective leadership and decision-making in biological systems. The findings suggest that leadership can emerge based on information differences among group members, without the need for explicit signaling or complex mechanisms.