Lustrous fur is a term used to describe the soft, glossy fur of certain animals. The term can be applied to three different animals: otter, ERMINE, and SABLE. Otters have thick, dark brown fur that is water-resistant and helps them stay warm in cold temperatures. ERMINE are small mammals with white fur and black-tipped tails, and their fur is highly valued for its softness and warmth. Sables are members of the weasel family and have thick, dark brown fur that is prized for its luxurious texture and shine. All three of these animals have lustrous fur that is highly sought after.