The sea otter (scientific name: Enhydra lutris) is a semi-aquatic mammal of the genus Sea Otter of the carnivores Mustelidae. Due to its dense fur, round body size and unique predation behavior of "tapping shells with stones", it has become one of the most iconic marine mammals along the North Pacific coast. As a "key species" of the ecosystem, its survival directly affects marine biodiversity and is also a flagship species for global marine conservation. The existing populations are mainly concentrated in the Russian Far East, the United States/Canada Alaska, California, Mexico Baja California.

It is a mammal living in North America, belonging to the Weasel family. Known for its strong forelimbs and ability to dig, it mainly inhabits open areas in grasslands, deserts, and mountainous regions. The body is thick and robust, with short and rough fur, and prominent white stripes on the face. The forelimbs are strong and powerful, with long and sharp claws, making them perfect for digging burrows and searching for food. It is a nocturnal animal that usually hides in underground caves during the day and comes out to forage at night. Food mainly includes the rhizomes of small mammals, insects, reptiles, and plants. He is a solitary hunter who usually lives alone except during the breeding season. Wild animals with unique lifestyles.

Commonly referred to as badger, it is a mammal that lives in the Eurasian continent and belongs to the Weasel family. Known for its strong body, robust neck, and sharp claws. Medium size, usually between 60 and 80 centimeters in length, with a weight of up to 20 to 30 kilograms. The nose and mouth are particularly developed, forming an organ called the "nasal disc" that is very suitable for digging and searching for food. It is an omnivorous animal that feeds on insects, small mammals, fruits, and roots. Known for its digging ability, it can dig soil to find food or build nests. Claws are very powerful and can easily dig through hard ground. Usually active at night.

The ferret (Mustelapulourius furo) is a mammal belonging to the family Mustelidae in the order Carnivora. The body of a ferret is slightly slender, streamlined, with a round body and no sharp corners or flat areas. Distributed in southern Canada and Oklahoma and Kansas in the United States. Ferrets love to play and live in groups. They mostly sleep throughout the day and prefer quiet environments. They are highly alert to external stimuli. Ferrets lack sweat glands and are not suitable for high temperature environments. When frightened, they will empty their anal glands and secrete musk. Ferrets are carnivorous animals that mainly feed on small vertebrates such as mice and rabbits.

Neovisonvison is a mammalian species belonging to the genus Neovisonvison in the family Italidae, order Carnivora. The tail is less than half the length of the head, and the ears are short and round. The body is slender and the limbs are short. The head is narrow and elongated, with a sensitive sense of smell and hearing. Residing in areas near freshwater. The lifestyle is semi aquatic. Carnivorous, mainly feeding on rodents, bird eggs and chicks, fish, insects, and plant fruits. Distributed in the United States and Canada. Usually active at night, occasionally appearing during the day. He is a great swimmer who can dive to a depth of 5 to 6 meters and won't chase prey for long distances in open waters. Still a skilled tree climber.

The sea otter is a mammal belonging to the Carnivorous Order, Weasel Family, and Sea Otter genus. Unlike other marine mammals, sea otters do not have a subcutaneous fat layer for warmth. The sea otter is a famous fur beast, and its fur serves to isolate and keep warm. The common name for sea otter fur is sea dragon fur, which is the most valuable type of fur, especially the fur in the center of the back, which is four times denser than mink fur, known as the "king of fur". Sea otters are the smallest marine mammals. The body is cylindrical, with a length of 1.40-1.48 meters and a weight of 32.5-45 kilograms. The flat tail accounts for about a quarter of the body length. The head is short and wide.