The cubs of spotted hyenas often begin fighting within moments of birth, and often one hyena cub dies. The mother hyena does not interfere. How could such a behavior have evolved? For instance: a. From the winning sibling's point of view, what must B (benefit of siblicide) be, relative to C (cost of siblicide), to favor the evolution of siblicide? b. From the parent's point of view, what must B be, relative to C, for the parent to watch calmly rather than interfere? c. In general, when would you expect parents to evolve "tolerance of siblicide" (watching calmly while siblings kill each other without interfering).
