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North American Porcupine

Erethizon dorsatum

Northamericanporcupine Gallery

About the North American Porcupine

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Geographic Range:

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Class: Mammalia  
Order: Rodentia
Family: Erethizontidae
Genus: Erethizon   
Species: dorsatum 

The North American porcupine has a thick underfur covered with long, wiry guard hairs on the front of its body. There are up to 30,000 shorter, heavier quills on its back, sides, legs, and tail. When threatened, the porcupine doesn’t “shoot” its quills. It sheds them upon impact so the quills imbed in their attacker. The name porcupine is derived from a French word meaning “thorny hog.”

Porcupine Facts

Appearance:
Porcupines have thick underfur covered with long, wiry guard hairs on the front half of their body. They have up to 30,000 shorter, heavier quills on their back, sides, legs and tail. They may have yellowish quills and yellow-tipped guard hairs, or white quills and white-tipped guard hairs. Their quills are hollow which provide buoyancy while swimming.

Due to long, curved claws, they have a pigeon-toed walk while on the ground. Their broad feet and sharp claws also help them dig for roots and for shelter. Like the beaver, the North American porcupine has bright orange incisors.

Size:
Weight: Up to 28 pounds
Length: 2.5 to 3.5 feet

Diet:
Porcupines enjoy a seasonal diet, feeding on the inner bark of trees and on evergreen needles during the winter. In the spring, they eat buds and in summer, roots, leaves, berries, fruits and seeds.  In the fall, they eat fruits and nuts. They also will gnaw on old bones and on shed antlers for calcium and salt. They may eat up to a pound of plant material per day.

Reproduction:
North American porcupines mate in the late summer/early fall. After about a 7-month gestation, a single offspring is born in the spring. The offspring‘s quills are soft upon birth but will quickly harden. At about two to three weeks, offspring are capable of feeding on plant material. About six months after birth, they are weaned and will leave the mother.  Maturity is reached by 2 to 2.5 years of age.

Behavior:
Porcupines are mainly nocturnal, but they may be seen during the day, especially in the tops of trees. They climb awkwardly, but they’re more at home in trees than on the ground. Generally, porcupines are solitary in the summer and colonial in winter, living in dens found in hollow trees or natural caves in rocks. They do not hibernate.

They communicate with grunts and high-pitched cries that may be heard for a quarter of a mile, especially in the fall rutting season. Acute hearing allows them to respond quickly to threats.

When threatened, they will rattle their quills to ward off predators. It's a common misconception that porcupines are able to "shoot" their quills. In fact, they shed them upon impact, so that the quills become imbedded in an attacker. Quills also provide buoyancy while swimming.

Habitat/Range:
North American porcupines are found in temperate forests. They range throughout North America, except for the southeastern US and southern Mexico.

Median Life Expectancy:
10 years.

Threats:
North American porcupines are a species of Least Concern. They are considered “pests” because they can damage ornamental plants, wooden buildings, tool handles and other wooden objects.  They are in danger of extinction in Mexico because of hunting.

Fun Fact:
The porcupine’s common name is derived from French and means “thorny hog,” referring to the animal's quills. The scientific name, Erethizon, is Greek for "arouse" and is a reference to the species' reputation for being irritable. Dorsatum, is Latin for back.