Answer
Male bee-eaters have evolved to fight against their parent bees so that they may raise their own offspring and further their reproductive line. If male bee-eaters promoted and raised their own offspring, they would create approximately 0.5 nestlings without helpers. If they serve in their parent's nest, the male bee-eaters will create 0.3 more siblings on average. As 0.5 is greater than 0.3, males should promote their own offspring by fighting their fathers.
Work Step by Step
Male bee-eaters have evolved to fight against their parent bees so that they may raise their own offspring and further their reproductive line. If male bee-eaters promoted and raised their own offspring, they would create approximately 0.5 nestlings without helpers. If they serve in their parent's nest, the male bee-eaters will create 0.3 more siblings on average. As 0.5 is greater than 0.3, males should promote their own offspring by fighting their fathers.
