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Kangaroo joey inside the pouch Female eastern grey kangaroo with mature joey in pouch. The pouch is a distinguishing feature of female marsupials and monotremes, [1] [2] [3] and rarely in males as well, such as in the yapok [4] and the extinct thylacine. The name marsupial is derived from the Latin marsupium, meaning "pouch".
Marsupials give birth at a very early stage of development; after birth, newborn marsupials crawl up the bodies of their mothers and attach themselves to a teat, which is located on the underside of the mother, either inside a pouch called the marsupium, or open to the environment. Mothers often lick their fur to leave a trail of scent for the ...
The gestation period for a pregnant female is around 13 days, with a pouch period of 6–7 months. [5] While females have four teats in their pouches and can have up to three young per birth, they rarely suckle more than two. [8] Each young weighs no more than 1 gram at birth, and is held in the mother's well-developed forward-opening pouch.
Common ringtail possum young tend to grow relatively slowly due to dilute milk with low lipid levels that is provided to the young. As with other marsupials, the common ringtail possum's milk changes through lactation. [19] During the second phase of lactation, more solid foods are eaten, especially when the young first emerges from the pouch. [19]
An average litter consists of 2 to 4 young. Being marsupials, the newborns are naked and immature and thus undergo extensive development within the mother's pouch. [10] The gestation period (12.5 days) is the shortest recorded for any mammal. [3] Bandicoots are also the only metatherian marsupials that have placentas similar to eutherian ...
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Antechinus do not have a complete pouch, as in other marsupials, but simply a flap of skin covering the teats. [1] The number of teats in Antechinus species varies between different populations of the same species, [ 2 ] [ 18 ] and can be anywhere from six to 13. [ 18 ]
Some writers have suggested [2] that the epipubic bones are a part of a kinetic link stretching from the femur on one side, to the ribs on the opposite side. This linkage is formed by a series of muscles: Each epipubic bone is connected to the femur by the pectineus muscle, and to the ribs and vertebrae by the pyramidalis, rectus abdominis, and external and internal obliques.