Common Features of Placental Mammals
Placental mammals hair or fur and give birth to living young through their placenta and feed them milk. They are very advanced mammals whose young are born at a more advanced stage than other mammals. There are almost 4,000 different known mammal species. The first placental mammal was discovered some 65 million years ago, in the triassic era. Mostly placental mammals are made up of rodents and bats. The placenta is for the benefit of the fetus’ nourishment. Placental mammals include all of the living mammals except marsupials and monotremes. Humans and regular animals in human life are placental mammals. They depend on the mother for food and drink. They need most attention from their family and as well as their pack. Placental mammals undergo embryonic development in the uterus. They give live birth of the offspring after the fetus matures up to a certain point. Placental mammals are far different but also more common of all mammal classes. The placenta involvement with the fetus is the most distinct characteristic of the placental mammals.
The fetus gets all of its nutritional requirements through the the placenta of the mother. Placental mammals can range from bats, to bears to the average dog. Some most common placental animals are – apes, bats, bears, bison, foxes, whales, beavers and even us human beings as well. They are known to live everywhere and are very good at adapting themselves to their surroundings. You will find that placental mammals exist in a variety of different environments be they hot or cold, light or dark, etc. That because there are many different species of mammals. Take the example of polar bears living in sub-zero environments. Also take the example of the whale which lives in the water as opposed to land. Placental mammals are also known as the dominant mammal species no matter when you look you are bound to find one. During the Ice Age, placental Mammals were widespread in North America.