Assertion: armadillo's shell | /r/MadeOf | bone
Facets:
Source sentences:
text: The armadillos were not immune to these new and larger predators — although their shells are made of bone, they are rather thin — even a medium sized dog would have little trouble biting through.
text: The turtle’s shell is made of several bones and is covered with scutes made of keratin.
text: Armadillos have a shell made of bone that only covers the top of the body and the tail.