Three-banded armadillos are capable of rolling into a complete ball to defend themselves.
/r/aww: A subreddit for cute and cuddly pictures - Things that make you go AWW! Like puppies, bunnies, babies, and so on... A place for really cute pictures and videos! - August 22, 2019 - 01:16
/r/Awwducational: Awwducational - Don't just waste time, learn something too! - August 21, 2019 - 23:19