'Hedgehogs are covered with quills or spines, which are hollow hairs made stiff by this protein'
keratin
HEDGEHOG-PODGE: Hedgehogs are covered with quills or spines, which are hollow hairs made stiff by this protein
Hedgehogs are covered with quills or spines, which are hollow hairs made stiff by this protein
Hedgehogs are covered with quills or spines, which are hollow hairs made stiff by this protein
HEDGEHOG-PODGE
keratin
HEDGEHOG-PODGE