Háozhū shùqǐ jiāncì shì diǎnxíng de fángyù xíngwéi.
A porcupine raising its quills is a typical defensive behavior.
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usage
Ethology/psychology term. Contrasts with 攻击行为 (aggressive behavior) and 求偶行为 (courtship behavior). Can apply to animals (startle, crypsis, quill raising) or to humans (psychological defense mechanisms).
