quills are part of a porcupine
crested_porcupine is porcupine. porcupine_quills has not barbs porcupine_quills has barbs prehensile_tailed_porcupine is porcupine. porcupines has not quills_for_protection_against_predators porcupette is porcupine. porcupines has quills_for_protection_against_predators porcupine is rodent.