From the category, the sea otter belongs to the phylum Chordata, class Mammalia, is a vertebrate, is also a mammal. As a vertebrate, the sea otter has a backbone and is an advanced animal compared with invertebrates. As mammals, some of their key characteristics are familiar to us, such as their viviparous reproduction, lung breathing, constant body temperature and so on. Compared with fish and reptiles, sea otters are a relatively advanced animal.
In addition, sea otters are carnivores in the order Carnivora. The main food of sea otters is some organisms in the water, such as fish, shellfish, abalone, shrimp, sea urchin, crab and so on. Sometimes they also eat some algae in the water. From the size point of view, sea otter is a relatively large animal, their adult body length between 1.3-1.5 meters, weight can reach 30-50 kg, compared with the same genus of otters, mink and other animals, their size is relatively large.
Although most animals in nature have natural enemies, some of them are very high in the food chain and have few natural enemies. For example, sea otters are relatively large, and they swim very fast in the water, and their ability to hunt is very strong. Sea otters can be said to be the natural enemies of many animals, such as sea urchins, and their favorite food is sea urchins. However, few animals can be called natural enemies of sea otters. Human beings can be said to be the natural enemies of many animals, to some extent, can also be the natural enemies of sea otters, human hunting will lead to the death of sea otters.
