The Mexican salamander is a species of amphibian in the family Salamandridae. Bare skin without scales; Both limbs and feet are short; Without vocal cords, unable to produce vocalizations; There are six external gill whiskers on both sides of the head, so it is also called a hexagonal dinosaur. The Mexican blunt mouthed salamander is distributed in central Mexico and is an endemic species of Mexico, famous for its unique appearance and juvenile continuation. The Mexican salamander is classified as critically endangered (CR) on the IUCN Red List of Threatened Species. In China, it is legal to buy and sell artificially bred Mexican salamanders as pets, but it is not allowed to buy and sell wild Mexican salamanders.

Walrus is a carnivorous mammal in the family Walrus, which has only one species and no subspecies. Walrus has a cylindrical body, thick and obese. The lifespan is around 50 years old. Walruses are mostly distributed in the Arctic Ocean, and their presence can sometimes be seen in the Atlantic and northern Pacific Oceans. They usually live in areas with a water depth of less than 80 meters and prefer habitats with gravel bottoms. The recipe is very broad, including over 60 types of marine organisms. Walruses have many survival skills, such as taking turns guarding, changing body color, basking in the sun in winter, and constantly using their noses to scoop wet sand on their bodies to absorb water and cool down in summer.

The Atlantic sturgeon (scientific name: Acipenser oxyrinchus) is a fish species of the sturgeon family and genus. The Atlantic sturgeon can weigh up to 300 kilograms and is 60 years old. It is also common to find individuals 4.3-5.3 meters long. Young Atlantic sturgeons generally inhabit their "mother river" and then migrate to the ocean over time.. Young sturgeons mainly inhabit freshwater rivers and feed on aquatic animals and plants. Adult sturgeons are also omnivorous, but parent sturgeons stop feeding during their spawning migration. Postpartum adult sturgeons mainly feed on gastropods and other benthic organisms in freshwater. The Atlantic sturgeon is distributed along the east coast of the Atlantic Ocean in North America.