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The neonatal of larger mammals develop relatively more quickly and thus making it more likely that a large mammal would produce a more well-developed neonate as a consequence of its longer gestation period. In some cases, some mammal species may have similar gestation periods despite having significantly different body masses. [22]
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 .
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 ...
Human pregnancy can be divided into three trimesters, each approximately three months long: the first, second, and third trimester. The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [ 6 ]
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.
They are among the largest extant species of shark, reaching a maximum confirmed length of 6.4 m (21 ft) long and weighing over 1,000 kg (2,200 lb). They reach sexual maturity at about 150 years of age, and their pups are born alive after an estimated gestation period of 8 to 18 years. [5]
A woman from Hunan, China, was pregnant for a record-breaking 17 months, according to People's Daily Online; she reportedly got pregnant in February 2015 and hadn't given birth by mid-August this ...
The North American porcupine has a long gestation period relative to other rodents, an average of 202 days. [38] By contrast, the North American beaver, which is comparable in size, has a gestation period of 128 days. [39] The eastern grey squirrel (Sciurus carolinensis) has a gestation period of just 44 days. [40]