“Porcupines are large rodents covered in sharp quills that detach easily when touched, but they can’t shoot them. There are two groups: New World porcupines of the Americas, which climb trees, and Old World porcupines of Africa, Asia, and Europe, which live on the ground. Porcupines eat bark, leaves, roots, and fruit.”
Few animals have a defense as famous as the porcupine’s. One look at those quills is usually enough to send predators the other way. But there’s a lot more to porcupines than their prickly coats. They’re among the largest rodents on Earth, some are skilled tree climbers, and many myths about them simply aren’t true. Here’s what you should know.
Porcupine Quick Facts
| Trait | North American Porcupine | Crested Porcupine |
|---|---|---|
| Group | New World porcupine | Old World porcupine |
| Weight | About 11 to 30 lb | About 29 to 60 lb |
| Range | Forests of North America | Africa, southern Europe (Italy) |
| Lifestyle | Climbs trees | Lives on the ground, burrows |
| Quills | About 30,000, short with barbed tips | Long, striped quills up to about a foot |
| Diet | Bark, twigs, leaves, buds | Roots, bulbs, bark, fruit |
Two Kinds of Porcupines
Porcupines belong to two separate families that evolved quills independently, a striking example of convergent evolution.
- New World porcupines live in North and South America. Many species climb trees, and some tropical species even have prehensile tails for gripping branches. The North American porcupine is the best-known member of this group.
- Old World porcupines live in Africa, Asia, and southern Europe. They’re ground dwellers that shelter in burrows and rock crevices. The crested porcupine is among the heaviest rodents on Earth.
Both groups are hystricomorph rodents, the same broad group that includes capybaras, guinea pigs, and chinchillas. See types of rodents.
How Porcupine Quills Work
Quills are modified hairs made of keratin, the same protein as human hair and nails. They’re stiff, hollow or spongy inside, and sharp at the tip. In North American porcupines, the tips carry microscopic backward-facing barbs that make them easy to push in and hard to pull out.
When threatened, a porcupine raises its quills, turns its back, chatters its teeth, and releases a strong odor as a warning. If a predator ignores the warning and makes contact, quills detach easily from the porcupine’s skin and stick in the attacker. Lost quills grow back.
Myth: Porcupines Shoot Their Quills
This is one of the most common animal myths. Porcupines can’t throw or shoot quills. The confusion likely comes from how easily quills release, and from porcupines swinging their tails at attackers, which can drive quills into a predator in an instant. Explore more misconceptions in rodent myths debunked.
What Do Porcupines Eat?
Porcupines are herbivores. North American porcupines eat leaves, buds, and green plants in summer and switch to the inner bark and needles of trees such as hemlock, pine, and fir in winter. They’re known for craving salt and may chew on tool handles, plywood, and road signs treated with salt. Old World porcupines dig for roots and bulbs and eat fallen fruit and bark.
Where Do Porcupines Live?
North American porcupines range from Alaska and Canada through much of the western and northeastern United States into northern Mexico, mostly in forests. Old World porcupines live in savannas, forests, and rocky hills across Africa and southern Asia, with crested porcupines also found in Italy. South American tree porcupines live in tropical forests. See rodents by continent.
Porcupine Behavior
- Mostly nocturnal: they forage at night and rest during the day in trees, dens, or burrows.
- Mostly solitary: though they may share winter dens.
- Slow and deliberate: they rely on quills rather than speed.
- Good swimmers: hollow quills help them float.
- Vocal: they moan, grunt, and whine, especially during mating season.
Baby Porcupines
A baby porcupine is called a porcupette. North American porcupines usually have a single porcupette per year, born with soft quills that harden within hours. The young can climb within days and stay near their mother for several months.
Predators
Most predators avoid porcupines, but a few have learned to attack their vulnerable face and belly. In North America, the fisher, a large member of the weasel family, is the porcupine’s best-known predator. Mountain lions, bobcats, wolves, and great horned owls sometimes take porcupines too. Dogs frequently end up with faces full of quills and need a vet to remove them safely.
What to Do If Your Dog Gets Quilled
Don’t try to pull the quills out yourself unless there are only a few and your dog is calm. Quills can break off and migrate deeper into tissue. Keep your dog calm and see a vet promptly; many dogs need sedation for safe removal. Never cut quills, which makes them harder to remove.
Porcupines and People
Porcupines sometimes damage trees, gardens, and wooden structures. Fencing, tree guards, and removing salty items usually solve the problem. See humane ways to manage wild rodents. In some cultures, porcupine quills have been used for decoration; Indigenous quillwork in North America is a centuries-old art form.
Porcupines vs Hedgehogs
Hedgehogs look similar but aren’t rodents at all. They’re small insect-eating mammals whose spines stay firmly attached. Porcupines are much larger rodents with detachable quills. Hedgehogs are sometimes kept as pets; porcupines are not suitable pets.
How Big Are Porcupines Compared with Other Rodents?
Crested porcupines rank among the heaviest rodents, behind the capybara and alongside beavers. See our rodent size comparison chart and compare with the largest rodent in our capybara facts.
Porcupines in Winter
North American porcupines don’t hibernate. In winter, they often spend days or even weeks in a single tree, eating bark and needles, or shelter in rock dens and hollow logs. Their dense underfur, hidden beneath the quills, provides insulation. Heavy snow can make travel difficult, so many porcupines stay close to their favorite feeding trees until spring. Learn about other rodents’ winter strategies in do rodents hibernate.
Why Porcupines Matter
By feeding on bark and twigs, porcupines prune trees and create openings that let light reach the forest floor. Their gnawing on fallen antlers and bones recycles minerals. They’re also an important food source for fishers and other predators. See why rodents matter to ecosystems.
Frequently Asked Questions
Can porcupines shoot quills?
No. Quills detach on contact but can’t be thrown.
How many quills does a porcupine have?
A North American porcupine has around 30,000 quills.
Are porcupines rodents?
Yes. They’re large rodents related to guinea pigs and capybaras.
Are porcupines dangerous?
They’re not aggressive, but their quills can injure pets and people who get too close.