What is the most likely adaptive explanation of infanticide in animals?

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Infanticide in animals, particularly observed in some mammalian species, is often explained as a strategy for increasing a male's reproductive success. By eliminating offspring that are not genetically his, a male can bring the female back into estrus sooner, allowing him to sire his own offspring with her. This behavior is a direct way to increase his fitness by ensuring the propagation of his own genes.

What Is the Most Likely Adaptive Explanation of Infanticide in Animals