Yes, it is. The shell is made up of thin bone plates, known as scutes. The armadillo is the only mammal that has bone plates in its skin. Fossilized scutes have been found in South America that are up to fifty million years old. Scutes as old as forty thousand years have been found in North America, around Illinois.
Armadillos make grunting sounds as they forage for food.
They also may squeak or squeal when they feel threatened. The screaming hairy armadillo is especially known for the loud squeals it makes. Armadillos produce a musky odor that some people find to be repulsive. The scent seems to be stronger when they feel threatened. First, armadillos will eat carrion, which in the US is often roadkill.