North American beaver large, webbed hind feet. The unwebbed front paws are smaller, with claws. The eyes are covered by a nictitating membrane which allows the beaver to see under water. The nostrils and ears are sealed while submerged. A thick layer of fat under its skin insulates the beaver from its coldwater environment. The beaver's fur consists of long, coarse outer hairs and short, fine inner hairs (see Double coat). The fur has a range of colors, but usually is dark brown. Scent glands near the genitals secrete an oily substance known as castoreum, which the beaver uses to waterproof its fur.
Animal welfare and rights in South Korea the lives, safety, and welfare of animals and to promote the emotional development of people so as to respect the lives of animals by providing for matters necessary to prevent cruelty to animals and to protect and manage animals appropriately". The law prohibits cruelty against vertebrates such as cattle, horses, pigs, dogs, cats, rabbits, chickens, ducks, goats, sheep, deer, foxes, and mink, but excluding fish, crustaceans, and other animals commonly used by humans. Cruelty includes killing an animal by a cruel method or in public or in the presence of an animal of the same species; injuring an animal with