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Q: Why would natural selection favor pigs?
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Why do pigs have sharp tusks?

Primitive species of pigs (such as bush pigs and wild pigs) have sharp tusks which are used to dig up roots. These roots and other similar plants such as tubers form the foundation for a wild pig's diet. Contrary to popular belief pigs are mainly herbivorous animals and their tusks are not used in hunting prey. --------------------- I take it he question is asking why natural selection favored pigs with sharp tusks. These tusks are offensive and defensive weapons, effective tools for foraging, and likely also used in courtship display. The animals that lacked them would not have been favored by natural selection for these reasons. The animals that lacked them would have been less able to forage for food, less able to defend themselves from rivals and predators, and quite probably less attractive to the opposite sex. These factors would gradually lead to a larger ratio of pigs with pronounced tusks in the population until eventually it became a common trait for the group.


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