Pearly gray fur is a term used to describe the fur of a CHINCHILLA, which is a small rodent native to the Andes Mountains in South America. Chinchillas have thick, soft fur that is usually gray or beige in color, with some having a pearly sheen. The fur is so dense that it can provide protection from cold temperatures and predators. Chinchillas are popular pets due to their playful nature and soft fur.