The most obvious adaptation of the porcupine is its quills as a method of defense. It has over 30,000 quills on its body which are long stiff hairs with barbed ends. When an animal comes near it can lash out its tail, sticking the quills into that animal. The body heat of the animal causes the barbed ends to expand and become even more embedded in the animal. Porcupines can’t shoot their quills, but they are a very valuable method of defense. A few other adaptations are that it can climb trees in order to find food, has become nocturnal where it is easier for them to forage for food in the absence of predators, and the ability to swim very well.
The quills are most definitely the most recognizable feature that is used for defense. Hairless soles on its feet help it climb trees. Check out the link for more information.
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