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The gestation period of marsupials is shorter than placental mammals of the same size because the young joeys, while in the uterus, have only a yolk-like placenta to sustain them for a short period of time. They are born, then make their way to the mother's teats, which are usually located within a pouch. There, they attach to a teat which swells in the joey's mouth and provides all the nutrition the joey needs to continue its development. The reason why these animals have such a short gestation period is because the pouch protects them, while the mothers' milk, supplied through the teat to which the joeys remain attached for several months, nurtures them much as the placenta does in placental mammals.
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What are the advantages of kangaroos having a longer gestation period?
Kangaroos do not have a longer gestation period, and to do so would be of no advantage anyway. Kangaroos are marsupials, and all marsupials are characterised by having a shorter gestation period than placental mammals of similar size. Most of the kangaroo Joel's development occurs in the mother's pouch, over a period of 8-12 months.
Which mammal has the longest gestation period and why?
In general, larger mammals have longer gestation periods. The African Bush Elephant has the longest gestation period at 22 months. Placental mammals have longer gestation periods than marsupials. Some small marsupials have gestation periods of less than two weeks.
What is the gestation period for a Asian carp?
a fish lays eggs so it doesn't have a gestation period
What is the gestation period of a Jersey cow?
Limousin are selected to have long gestation periods, which is around 290 to 300 days (or more) in length.
What is the gestation period of a fairy?
Fairies don't give birth, so they don't have gestation periods.
What is the terminal days for a tiger?
The gestation period in the case of the tiger is short being about 105 days. Since the tigress even during the terminal days of her pregnancy has to hunt for herself, nature has ensured that her pregnancy does not disable her from doing so. It is for this reason that the gestation period is so short the fetal size at birth small and the stage of development of the cubs when they are born rather low.
Why do mice have a shorter gestation period than other mammals?
Smaller mammals have shorter gestation periods. If a mother mouse kept her young inside her uterus/placenta for too long, the young would become so big that the mother would die. Also, mice have very short lifespans due to their heavy predation and small size, so a female mouse needs to produce as many young as possible in her short life in order to keep the species from going extinct. A short gestation period increases fertility in that more litters can be produced in the same amout of time. Thus, mice have evolved very short gestation periods. Although a mouse's gestation period is only about 20 days, there are some mammals, such as certain opossums, whose gestation periods are even shorter.
What is the Gestation period for a cassowary?
Cassowaries are birds, so they do not have a gestation period, as gestation refers to the length of a pregnancy. Cassowary eggs take between 50 and 60 days to incubate, or hatch.
Why is it so difficult to find out the gestation time of love bird eggs?
Probably because they have no gestation period. Although their eggs have an incubation period.
The length of time between fertilization and birth?
The period between fertilization and birth is called pregnancy or the gestation period. For humans, gestation lasts about nine months. and isn't it cute. SO ADORABLE
What is a one letter word for a kangaroo pouch?
Kangaroos are marsupials and, like most (but not all) marsupials, they have a pouch, which is actually called a marsupium. This is positioned at the lower front of the abdomen. All baby marsupials, known as 'joeys' are born very undeveloped after a short gestation period, so they continue to develop in the marsupium, or pouch, for many more months. The purpose of the marsupium is to protect the joey until it has developed enough whereby it can look after itself.
What is period between fertilization and birth?
The period between fertilization and birth is called pregnancy or the gestation period. For humans, gestation lasts about nine months. and isn't it cute. SO ADORABLE
