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No, they cannot mate. The reason for this is way the fetus develops in each animal is very different. The placental mammal fetus grows and matures within the mother's uterus for the entire pregnancy, obtaining nourishment from the placenta. When the infant is born, it is fully formed and can survive outside the womb. Marsupial fetuses exit their mother's body when they are very tiny and at a primitive stage of development and then make their way up the mother's abdomen and into the pouch (or, in some cases, a mere flap of skin), where they will latch onto the mother's teat for nourishment while they continue to mature and grow until the infant marsupial is able to survive outside the pouch. The teat actually swells in the embryo's mouth, securing it in place.
Marsupials have very different reproductive systems to that of placental mammals. Female marsupials have two vaginas, or what are called paired lateral vaginae. These are for the purpose of transporting the sperm to the womb, but there is a midline pseudovaginal canal for actually giving birth. As well as two vaginas and two uteruses, female marsupials have two fallopian tubes and two cervixes. Most male marsupials, with the exception of the largest species, the Red Kangaroo, Eastern Grey and Western Grey Kangaroos, have a two-pronged penis to accommodate the females' two vaginas.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoMarsupials do have placentas, but not like those of placental mammals. Placental mammals are so named because they have placentas, which transfer oxygen and nutrients to the fetus. Marsupials also have placentas, but they are only choriovitelline and get most of the nutrients from the egg sac.
Wiki User
∙ 10y agoYes, that is correct.
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Why do some animals not need a placenta?
Not all animals have placentas because they lay eggs instead. Only mammals have placentas by the way. Other animals use eggs and amniotic eggs.
What is something only mammals share?
Mammals are the only creatures to feed their young on mother's milk.
Do tuna have placenta?
No, tuna fish do not have placentas. The placenta is part of mammal physiology, and fish are not mammals.
What type of placenta does an orange have?
Oranges do not have placentas. Placentas are only found in mammals, where they play a crucial role in providing nutrients and oxygen to the developing fetus. Fruits such as oranges have a different type of reproductive structure called ovary or carpel, which protects the seeds and aids in their dispersal.
What are creatures that swim called?
mammals, and aquatic creatures.
What organ do pregnant monotremes and marsupials lack?
A complex placenta. Marsupials have a choriovitelline placenta, but it is not as well-developed as the placentas of placental mammals.
Do rabbits lay eggs?
No. A rabbit is a mammal all mammals, except for the platypus and the Echidna both native Australian native mammals, give birth to living creatures and give their babies milk, unless the creatures died in utero , then they give birth to dead creatures. Male rabits also are the only mammal to have the scrotum in front of the penis.
Why are bats unusual mammal?
Bats are unusual mammals because they are the only mammals capable of free flight. Creatures such as the various species of possum known as gliders are not capable of free flight - they can only glide between high points. Bats are therefore the only true "flying mammals".
Is dophins is a sea creatures?
Dolphins are sea creatures but they are also mammals like whales.
Why do you have hair on your body?
We are mammals and mammals are land creatures. We have hair to keep ourselves warm.
What is a good intro sentence about mammals?
Mammals are creatures that can feed their young with their own milk.
Do dolphins have placentas?
Yes, they do; the sub-class Eutheria (placental mammals) includes all orders of mammals except monotremes (platypuses and echidnas) and marsupials (opossums, kangaroos, etc.). Cetaceans (whales, dolphins and porpoises) are included.
