Quills function a a shield made of barbs. They can also be driven into the predator. Once a porcupine has stuck its quills into an enemy, the porcupine needs to quickly separate from the quills. ... The force to help the release of the quills is supplied by the contact with the would-be predator.
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A porcupine pokes its predators with the help of its quills. This defense is known as porcupine doctrine.
Porcupines are large rodents with coats of sharp spines, or quills, that protect them against predation. The term covers two families of animals: the Old World porcupines of family Hystricidae, and the New World porcupines of family Erethizontidae.
Porcupines have soft hair, but on their back, sides, and tail it is usually mixed with sharp quills. These quills typically lie flat until a porcupine is threatened, then leap to attention as a persuasive deterrent. Porcupines cannot shoot them at predators as once thought, but the quills do detach easily when touched.
Taipei's defence plan is based on a strategy of asymmetric warfare – what is known as the “porcupine doctrine”. This involves tactics for “evading enemy's strengths and exploiting their weaknesses” and a set of escalating options that acknowledge China's proximity to Taiwanese coast.
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