We are the main predators to porcupines because we destroy their habitat.  We also kill them as they cross the road. Thirdly humans prey upon porcupines because they will eat shovel handles, leather boats, and any other item that is salty.  People also prey upon porcupines because they think they are pesky, because they will go to a camp and eat things like shovel handles and any other item that has salt on it.

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