Asian small-clawed otter (Aonyx cinerea), which is distributed throughout Asia, is a famous amphibian. It likes to live in the bush near the water source. The area inside is designed according to their living habits. Otters are small mammals that like to rest during the day and come out at night. They are good swimmers and divers and are said to be able to dive for about eight minutes at a stretch. They are especially good at catching fish, so fishermen train them to help them catch fish, and affectionately call them fish cats. The otter’s fur is thick and soft, almost impermable to water, and provides excellent insulation and frost resistance. We often say that the rabbit has a very high defense vigilance, in fact, otter is the same, it is mysterious having several residences. They often move, so it is very difficult to catch otters, but their living environment has been destroyed by human beings, making them less and less. So now they have been listed as the national key second-class protected animals.