Hanby and Bygott, a husband-and-wife team, spent four years observing lions at the Serengeti Research Institute; the narrative-report thereon follows the female pride of the Sametu plain, focusing on one of the sisters and working in representative episodes that reveal the lions' social structure, mating and cub-rearing behavior, hunting and territoriality, along with their responses to what Hanby describes as the ""striking seasonal changes in the food supply."