Think of porcupines and one usually thinks of the mountains and pine trees.  But they do live on the prairie and occasionally at the river.  One lady I met who lives in the country says they come on to her porch at night looking for dog food.   They are a rodent, as are beavers, and can live into their twenties.Porcupine

Only twice have I encountered a porcupine on the ground.  Usually they are in trees and not only easy to spot but difficult to ignore.  Very docile, not aggressive at all.

Porcupine

Porcupine

Porcupine

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