Assertion: baby porcupine | /r/HasProperty | born their quills
Facets:
Source sentences:
text: When baby porcupines are born their quills are soft, but within an hour they harden.
text: All baby porcupines (or porcupettes) are born with their quills, but the quills are too small and flexible to be very effective against predators until the porcupine is several months old.