Otter belongs to the phylum Chordata, which is a vertebrate. Otters have a backbone, which distinguishes them from invertebrates. In terms of specific classification, otters are mammals, that is to say, they belong to mammals and have many characteristics of mammals. For example, there are lungs, a relatively advanced body structure, and use the lungs to breathe; Moreover, they will adopt viviparous reproduction and so on. These characteristics distinguish it from amphibians and fish.
In addition, otters can be divided according to their feeding habits. An animal of the order Carnivora, a type of carnivore whose primary food is fish in the water. When they hunt, they dive into the water. Otter's swimming ability is relatively strong, can prey on a lot of fish as their own food.
Under normal circumstances, otters can live for more than 10 years. Some otters have a longer life span. They can live for about 20 years. However, not all otters live this long, because there are many factors that affect their longevity in real life. For example, human injury is an important factor, and human hunting is one of the important reasons for their decline. In addition, some otters can be affected by human factors, thus shortening their life span. For example, human activities will pollute the living environment of otters, in which case the life span of otters will be shortened.
