Otter is a kind of animal that we are familiar with, and they often move in the water. Their main food is fish, and when they hunt, they go to the water. However, they are not always in the water, and sometimes they will move to the land. Therefore, many people will think that otters are amphibians because of this characteristic, in fact, otters are not amphibians, but mammals.
Otters are mammals in their category, so there is no doubt that they belong to mammals. Amphibians and mammals are two different animals, there is no intersection between the two, belonging to one can not belong to the other. Therefore, as a mammal, otters can not belong to amphibians, and otters are more advanced than amphibians. In fact, otters are very different from amphibians. For example, from the point of view of reproductive methods, otters use viviparous reproductive methods, while amphibians use oviparous; For example, from the point of view of body temperature, otters are thermostats, while amphibians are basically poikilotherms.
As mentioned above, otters can move both in the water and on land, so they can leave the water. In fact, otters belong to a semi-aquatic animal, and their living environment is often shallow water in freshwater basins such as lakes and rivers. But otters don't stay in the water all the time. Their burrows may be built at the bottom of rock crevices or in bushes on the shore, and they also go to burrows to rest.
