Lions are among the most charismatic animals on Earth, but their populations are vanishing across Africa. Serengeti lions—embodying both power and grace in one of the world’s most iconic landscapes—are one of the last remaining strongholds. We study their ecology, both at the core of the ecosystem where human impact is minimal, and at the edges, where lion and people interact. This contributes both to conserving lions and the safety of people living with them.