Marsupials consist of over 300 species of the infraclass Metatheria (also called Marsupialia). Marsupials are a mammalian group characterized by premature birth with the newborn's continued development happening while attached to the mother's nipples in her lower belly.
The major groups of marsupials are the American marsupials and the Australian marsupials.
American marsupials are found in North, South, and Central America, the two popular groups are the opossum, and shrew opossum. Australian marsupials are found in Australia and New Guinea and the animal groups are Kangaroos, Wallabies, Koalas, Quolls, Wombats, Numbats, Possums, Bandicoots, and many more.
Here are 10 facts about marsupials that you might find interesting.
1. Species Variety
The species vary so much, with about 99 species of American marsupials and 235 species of Australian marsupials. Of these 50 different types of marsupials, the most diverse marsupial groups are the Diprotodontia. This is a group of Australian marsupials that consists of about 120 species of Kangaroos, Wallabies, Wombats, Possums, and Koalas.
2. The Smallest Marsupial
The Long-tailed Planigale is the smallest marsupial, it measures between 2 and 2.3 inches and it weighs 4.3grams. The Long-tailed Planigale is a nocturnal creature that inhabits a diverse area in northern Australia, including clay soil woodlands, floodplains, and grasslands.
3. The Largest Marsupial
This is the red kangaroo. Their color is rusty red, males grow to be more than two times bigger than females. They weigh from 55 pounds to 200 pounds, while measuring between 3.25 to 5.25 feet in length.
4. Marsupial Diversity
Marsupials in Australia and New Guinea are so diverse, as a result of the absence of placental mammals in these regions. Marsupials have been displaced In places where they evolved side by side with placental mammals through competition for food, territory, and so on. Marsupials in Australia and New Guinea, where there are no placental mammals have been allowed to evolve and diversity into varying forms.
5. Marsupials Don't Have A Placenta
This is one of the major differences between marsupials and placental mammals. Placental mammals develop in the mother's womb, where they get the necessary nutrients for development through the placental. The embryo of a placental mammal is connected to the mother's blood supply through the placenta, which allows the embryo to get nutrients and exchange gas, as well as excrete waste.
Marsupials don't have a placenta, and so they are born earlier into their development, and they only fully develop while out of the womb and attached to their mother's nipples for milk.
6. Marsupial Birth
Marsupials have very short gestation periods, they give birth to their young early into the development stages. Marsupials are born in a "close to embryonic" state. They are born with their eyes, ears, and rear limbs barely developed. But, their forelimbs, mouth, and nostrils which they need to crawl to their mother's pouch and feed off their mother's teat are well developed at birth.
The gestation period for Virginia opossum is between 12 and 13 days and the newborn offspring is just about the size of a jelly bean, while red kangaroos gestation period Is 30 days with the babies weighing 1gram at birth.
7. Development In The Pouch
Most young marsupials continue to develop in their mother's pouch after birth. Young marsupials have to crawl from their mother's birth canal to her nipple, which is in the pouch for most species. On getting to their mother's pouch, they attach themselves to her nipple to feed on her milk where development continues. They emerge out of the pouch when they must have reached the development of a newborn placental mammal.
8. Double Reproductive Tract
Female marsupials have two uteruses, with each having its lateral vagina, and their offspring are born through a birth canal. This is unlike placental mammals that have one uterus and one vagina.
9. Marsupial Movement
Kangaroos and wallabies move by hopping in their long back legs. Hoping requires a considerable amount of energy, which makes hopping at a low speed quite inefficient. Movement becomes more efficient when they hop at a high speed. Some other marsupials move by running on their four limbs or by climbing and others move by waddling.
10. The Only Marsupials In North America
The only marsupial species that inhabit North America is the Virginia opossum (also known as the North American opossum). They are the only marsupials that can be found in northern Mexico. They are referred to as "opossum" in the United States. The Virginia opossum or North American opossum are nocturnal creatures and they are also solitary animals, and they are the largest of all opossums. They usually measure between 13 - 37 inches long from snout to the base of their tail, plus an additional 8.5 - 19 inches in length of their tail. Males weigh between 1.7 - 14 lb while females weigh between 11ounces - 8.2 lb.
Marsupials are one of the most variably sized mammals, as a large species can be up to 20 times the size of a small female from other regions. There are many interesting facts about marsupials, but the mentioned above are the 10 most worth-mentioning.
