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As marsupials, female opossums have a reproductive system that includes a bifurcated vagina and a divided uterus; many have a pouch. [29] The average estrous cycle of the Virginia opossum is about 28 days. [30] Opossums do possess a placenta, [31] but it is short-lived, simple in structure, and, unlike that of placental mammals, not fully ...
The water opossum and the now extinct Tasmanian tiger are the only two marsupials where the male also has a pouch (in order to protect their genitalia while swimming). [ 7 ] Some marsupials (e.g. phascogales ) lack the true, permanent pouches seen in other species.
A pouch is present in most species. Many marsupials have a permanent bag, while in others such as the shrew opossum the pouch develops during gestation, where the young are hidden only by skin folds or in the maternal fur. The arrangement of the pouch is variable to allow the offspring to receive maximum protection.
Being a marsupial and at the same time an aquatic animal, the water opossum has evolved a way to protect its young while swimming. A strong ring of muscle makes the pouch (which opens to the rear) watertight, so the young remain dry, even when the mother is totally immersed in water. [6]
Females have a gestation period of 16–18 days, after which they give birth to single young. [7] [8] A newborn brushtail possum is only 1.5 cm (0.6 in) long and weighs only 2 g (0.07 oz). As usual for marsupials, the newborn may climb, unaided, through the female's fur and into the pouch and attach to a teat.
Speaking about opossums, not everyone knows that these animals are related to kangaroos and koalas, since they are marsupials, and their babies stay in their pouches for up to three months.
Unlike most other marsupials, the gray short-tailed opossum does not have a true pouch. The scientific name Monodelphis is derived from Greek and means "single womb" (referring to the lack of a pouch) and the Latin word domestica which means "domestic" (chosen because of the species' habit of entering human dwellings). [3]
She says her family happened upon the mousse-munching marsupial in her backyard while preparing to have guests over for a Super Bowl party. The opossum chilling after a very filling dessert.