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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.
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 ...
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.
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.
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]
Elephants have the longest gestation of any creature on the planet. Asian elephant gestation periods last anywhere from 18-22 months, while African elephant gestations last a full 22 months. That ...
Marsupials have a short gestation period—typically between 12 and 33 days, [38] but as low as 10 days in the case of the stripe-faced dunnart and as long as 38 days for the long-nosed potoroo. [39] The baby (joey) is born in a fetal state, equivalent to an 8–12 week human fetus, blind, furless, and small in comparison to placental newborns ...
The gestation period of ruffed lemurs is the shortest of the family Lemuridae, averaging 102 days (with a range of 90 to 106 days). [9] [12] [16] Gestation in the wild last slightly longer than in captivity, averaging 106 days. [20]