Porcupines' quills, or spines, take on various forms, depending on the species, but all are modified hairs coated with thick plates of keratin, and embedded in the skin musculature. Quills are released by contact or may drop out when the porcupine shakes its body. New quills grow to replace lost ones.
When it is confronted by a predator, the African crested porcupine raises the quills along its head and back into a crest so its body appears larger and more threatening. If this strategy doesn't chase off the predator, the porcupine stamps its feet, clicks its teeth, and rattles its hollow-tipped tail quills.
Bag includes various sized rattles from 5.5cm to 9.2cm