Assertion: porcupine | /r/HasProperty | threatened by predator
Facets:
Source sentences:
text: When threatened by a predator, the porcupine freezes, and if the attacker continues its pursuit, they lift their quills, rattle their tails, stomp their feet, hiss, and snort.
text: When threatened by a predator, the porcupine usually shakes its tail quills, which are hollow and sound like a rattle; if this doesn’t scare the enemy away, the porcupine charges backwards, trying to stab the predator with its back quills.