Dolphins are one of the common animals living in the ocean. Amphibians are a general term for animals in a relatively large category, which contains more animal species. This kind of animals generally have a more important feature, that is, they can live in water or on land, that is, "amphibious". Amphibians are animals in the class Amphibia. Dolphins do not belong to amphibians, because they belong to the class Mammalia and are mammals.
As mammals, dolphins are a more advanced animal, they are more advanced than amphibians. Moreover, dolphins have some key characteristics that are different from amphibians. The crucial feature of mammals is that they reproduce viviparously, with a period of lactation after the birth of their young, but amphibians are generally oviparous. The change of body temperature is also a key feature. Dolphins, as mammals, are thermostatic, but amphibians are lower animals. They are poikilothermic animals. Their body temperature will change with the changes of the outside world, and sometimes the range of change is relatively large.
above, dolphins belong to the class Mammalia and are mammals. Among mammals, there are cetaceans, which is also a general term for a large group of animals, including more animal species. Dolphins are one of them. In terms of specific classification, dolphins belong to the dolphin family in the suborder of Mammalia, which belongs to cetaceans. As a cetacean, dolphins share some key characteristics with other cetaceans, such as reproductive methods and breathing methods.
