Do kangaroos belong to mice?

Australian kangaroos and American opossums both look like mice, and their names are also "mice". But they are not rats. What's going on here? Let's talk about kangaroos first Kangaroo is a specialty of Australia and a national treasure of Australia. Their biggest feature is that there is a "bag" for raising children on their chests. Kangaroo's front and rear limbs are not consistent, the first two limbs are small, the latter two limbs are particularly developed, and they jump when walking. There are more than 50 kinds of kangaroos, which are as big as goats and weigh about sixty or seventy kilograms. As small as a rabbit; The smallest individual is as big as a big mouse. Although kangaroos are bigger than mice, they are less evolved than mice. Zoologists think kangaroos are lower mammals. Because the larvae of mammals generally develop in the placenta of their mothers, they are called placental mammals. Kangaroos, on the other hand, have no placenta. Their young are not only as thick as human fingers, but also very immature. Kangaroo cubs are discharged from their mother's reproductive tract and reach the root of their mother's tail, then waddle to their mother's breast-feeding bag along the wet path licked by their mother and suck the milk in the bag. After that, it will take several months for the cubs to complete most of their development. Zoologists believe that this way of raising children is far behind that of mammals with placenta. Because of this, kangaroos belong to marsupials in animal classification. On the other hand, rodents belong to mammals. So don't mistake a kangaroo for a mouse just by looking at the literal meaning. Let's talk about opossum again. In the United States, especially in South America, there are many small and medium-sized animals called opossums. These opossums are divided into several types: small opossums that live in trees and look like mice, fluffy opossums with thick fur all over their bodies, and webbed opossums suitable for aquatic life ... but almost all opossums have one thing in common, that is, they have sharp claws, long tails, are good at climbing, and can hang themselves upside down on branches and wind them with their tails. The characteristics of opossum parenting are similar to those of kangaroo. The newborn opossum is only the size of kidney beans. After the baby is born, the mother opossum puts it in the outer skin of the abdomen and feeds it for another two months. The name opossum comes from this. Because of this feature, animal taxonomists also classify them as marsupials. After living in the pouch of the mother mouse for two months, the young opossum can freely enter and leave the pouch, but will not leave the mother mouse. In another month or so, you can leave your mother and live independently. Opossum is used to hunting at night. They eat almost everything. It can be seen that the opossum we are talking about is also fundamentally different from the general rodent mammals, so it should not be attributed to mice.