Elephants have up to 1.5-inch thick skin that protects them from sharp plants and sunlight, while helping retain moisture.
Rhinos possess up to 2-inch thick, armor-like skin that shields them from predators and harsh environments, although they are prone to sunburn.
Hippos feature up to 2-inch thick skin that provides protection from predators and the sun, and they use mud and water to cool down.
American bison have up to 2-inch thick, rugged skin and furry coat that offers protection and insulation in varying weather conditions.
Walruses have up to 1.5-inch thick skin with a fat layer for warmth in icy Arctic waters, and use their tusks for defense and ice navigation.
Manatees have up to 2-inch thick, wrinkly skin covered with algae, which serves as a protective layer and helps them defend against threats.
Armadillos are covered in armor-like skin up to 0.75 inches thick, providing protection from predators and environmental dangers.
Narwhals have up to 1-inch thick skin, covered by a thick layer of blubber for insulation in the cold Arctic waters.
Rhinoceros iguanas feature rough, scaly skin up to 0.39 inches thick, which protects them in their rocky, Caribbean habitat.
Harp seals have skin up to 1.5 inches thick with a layer of blubber, crucial for insulation in the frigid North Atlantic and Arctic Oceans.