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In page Siblicide:

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Parent–offspring conflict is a theory which states that offspring can take actions to advance their own fitness while decreasing the fitness of their parents and that parents can increase their own fitness while simultaneously decreasing the fitness of their offspring. This is one of the driving forces of siblicide because it increases the fitness of the offspring by decreasing the amount of competition they have.[3] Parents may either discourage or accept siblicide depending on whether it increases the probability of their offspring surviving to reproduce.[3]