Adult porcupine (Erethizon dorsatum) foraging near Mendenhall Glacier, Southeast Alaska, United States of America, North America

Adult North American porcupine (Erethizon dorsatum), running in Glacier Bay National Park, Alaska, United States of America, North America

Adult North American porcupine (Erethizon dorsatum), climbing a tree, Glacier Bay National Park, Alaska, United States of America, North America

An adult North American porcupine (Erethizon dorsatum), Bartlett Cove, Glacier Bay National Park, Southeast Alaska, United States of America, North America

Adult North American porcupine (Erethizon dorsatum), climbing a tree, Glacier Bay National Park, Alaska, United States of America, North America

High angle view of trees in the forest, Porcupine Mountains Wilderness State Park, Upper Peninsula, Michigan, USA

North American porcupine (Erethizon dorsatum) eating spring fresh leaves up in an aspen tree, Forillon National Park; Quebec, Canada

Porcupine up a tree eating buds, northern British Columbia

North American porcupine in tree

American porcupine on bank, Denali NP Alaska

American porcupine on pebbles, Denali NP Alaska

American porcupine on pebbles, Denali NP Alaska

American porcupine on pebbles, Denali NP Alaska