North American Porcupine - Erethizon dorsatum - Noord-Amerikaans Boomstekelvarken (Oerzon)
Alaska, Canada, West- and Northeast-USA and extreme North-Mexico.

There are 7 subspecies being recognized:
Erethizon dorsatum dorsatum - From Nova Scotia to Alberta and from Virginia to Yukon;
Erethizon dorsatum picinum - Northeast-Quebec and Labrador;
Erethizon dorsatum couesi - From Colorado south to North-Mexico;
Erethizon dorsatum bruneri - Arkansas to Montana;
Erethizon dorsatum epixanthum - Western-USA, from North-Dakota to Mexico;
Erethizon dorsatum nigrescens - British-Columbia south to Washington (including Rocky Mountains);
Erethizon dorsatum myops - Alaska to Yukon.

Of this species there are also Zoo Photo's available.