Assertion: hedgehog's spike | /r/Synonym | quill
Facets:
Source sentences:
text: But the hair on the back of a hedgehog is a thick layer of spikes (or modified hairs) known as quills.
text: But the hair on the back of a hedgehog is a thick layer of spikes (or modified hairs) known as quills.
text: But the hair on the back of a hedgehog is a thick layer of spikes (or modified hairs) known as quills.
text: Hedgehogs have a thick layer of spikes (or modified hair) known as quills .