Have you ever seen an armadillo? They are placental mammals with a leathery armor shell.
I don't think I've ever seen one in person! Is the shell leathery? I thought it would be harder.
It is leathery, but is quite tough. In fact "armadillo" means "armored one" in Spanish.
Oh that's cool! So where do they originate from?
They are native to the Americas, where they live in a variety of environments.