Assertion: cassowary's casque | /r/MadeOf | sponge-like material
Facets:
Source sentences:
text: The casque is made of a sponge-like material and covered with a thick layer of keratin, the same thing our fingernails are made of.
text: The casque is made of a sponge-like material and covered with a thick layer of keratin, the same thing our fingernails are made of.