Erethizon

Approximate number of quills on a North American porcupine, which is prevalent in the Upper Peninsula and northern half of the Lower Peninsula.

Kevin is a North American porcupine - one of the largest rodents in the world - and was born at Hagenbeck zoo in Hamburg, Germany.

The North American Porcupine (Erethizon dorsatum) has a broad geographic distribution, spanning much of North America south of the tree line (Wood 1973).

New distributional record of the North American porcupine Erethizon dorsatum in Chihuahua, Mexico.

A North American porcupine has quills, guard hair and fur on their body.

The North American porcupine is the largest of the species and can contain more than 30,000 quills.

The subnivium lets many plants, animals (such as the North American porcupine, left) and microbes spend winter in a slightly warmer zone where temperatures rarely fluctuate.

One pellet contained only the quills of a young North American porcupine as judged by quill size and structure.

Predation as a probable mechanism relating winter weather to population dynamics in a North American porcupine population.

I had grown accustomed to the quillwork of the North American First Nations women who embroidered their delicate designs with colourfully dyed, 5-centimetre-long quills of the North American porcupine, Erethizon dorsatum.

The North American porcupine has approximately 30,000 defensive quills on its back.