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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 ...
The young are therefore born at a very early stage, although the gestation period is similar to that of many other small marsupials, at only 12 to 14 days. [33] They give birth to litters of up to 20 young. [34] Once born, the offspring must find their way into the marsupium, if present, to hold on to and nurse from a teat.
Succeeding a 3-week gestation period, females give birth with their hindquarters raised and their tails curled. Around 2 to 6 young are born, starting life at only 7 mm, and increasing in size by more than 5 times during their first month.
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.
Originating in Persia (modern-day Iran), Persians are one of the oldest and most recognizable cat breeds. They enjoy a life expectancy of 11 years. However, due to their distinct features, they ...
The average life expectancy of all domestic cat breeds was 11.7 years. Crossbreeds and Siamese came very close to that mark at 11.9 and 11.7 years, respectively.
Among mammals, marsupials and most rodents are altricial. Domestic cats, dogs, and primates, such as humans, are some of the best-known altricial organisms. [14] For example, newborn domestic cats cannot see, hear, maintain their own body temperature, or gag, and require external stimulation in order to defecate and urinate. [15]