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This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs. A marsupial has a short gestation period, typically shorter than placental.
A marsupial has a short gestation period, typically shorter than its estrous cycle, and gives birth to an underdeveloped newborn that then undergoes further development; in many species, this takes place within a pouch-like sac, the marsupium, located in the front of the mother's abdomen.
The duration of this period varies between species. For most species, the amount a fetus grows before birth determines the length of the gestation period. Smaller species normally have a shorter gestation period than larger animals. [2] For example, a cat's gestation normally takes 58–65 days while an elephant's takes nearly 2 years (21 ...
The stripe-faced dunnart breeds from July through February and has a gestation period of eleven days, the shortest of any mammal. [8] The species is polyoestrous with a mean cycle length of 23–25 days. [9] Males are capable of breeding throughout the breeding season and for up to three seasons. [10]
Golden hamsters and other species in the genus Mesocricetus have the shortest gestation period in any known placental mammal at around 16 days. Gestation has been known to last up to 21 days, but this is rare and almost always results in complications.
Marsupials have a very short gestation period—usually between 12.5 and 33 days, [41] but as low as 10.7 days in the case of the stripe-faced dunnart and as long as 38 days for the long-nosed potoroo. [42]
The gestation period is 27–28 days, and they have 2–6 cubs per litter. [ 2 ] [ 8 ] Cubs are born naked and blind, weighing only 0.2 g (0.0071 oz). After their eyes open at 14 to 16 days old, they mature quickly.
The gestation period of peramelids is the shortest among mammals, at just 12.5 days, the young are weaned around two months of age, and reach sexual maturity at just three months. This allows a given female to produce more than one litter per breeding season and gives peramelids an unusually high reproductive rate compared with other marsupials.