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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.
Gestation, called pregnancy in humans, is the period of time during which the fetus develops, dividing via mitosis inside the female. During this time, the fetus receives all of its nutrition and oxygenated blood from the female, filtered through the placenta , which is attached to the fetus' abdomen via an umbilical cord .
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.
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 months). [3] However, growth does not necessarily determine the length of gestation for all species, especially for those with a breeding season. Species that ...
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]
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals , but also occurs for some non-mammals.
In captivity, the gestation period for Campbell's dwarf hamster is between 18 and 20 days, and the shortest gestation period recorded for a captive female was 13 days. [27] [32] The male hamster is likely to assist the female during birth. The male may pull the offspring from the birth canal, clean them, or collect food for the mother and ...
Greater bilbies have a very short gestation period of about 12–14 days, one of the shortest among mammals. [22] The young are only 0.25 in (0.6 cm) long and very underdeveloped when they are born. They must crawl to the mother's pouch and latch onto one of her eight teats.