Welcome to GestationPeriods.com

GestationPeriods.com was created to help people find interesting information about the gestation, pregnancy and due dates of both humans and animals. We provide pregnancy care tips as well as different online gestation/due date calculators and printable charts that could be used to find the estimated due date of varieties of animals.

Animal reproduction classifies living beings in the Animalia kingdom into four groups according to the characteristics it presents: Viviparous, Ovoviviparous, Oviparous and ovuliparous. Although the term gestation can be used interchangeably in these four modes of reproduction to refer to the process by which an animal reproduces and is capable of having offspring, we will strictly speak of gestation when it is a viviparous animal. It is only in this group of animals that the offspring develops within the mother’s womb from the moment of conception until birth, exchanging substances with the mother and supplying her energy reserve.

What is Gestation?

The term “gestation” was formed from a Latin word “gestare” which means ‘to carry or bear.’ Gestation is simply defined as the time period between conception (being pregnant) and parturition (giving birth). In other words, it is the period of time when the development of the fetus or baby occurs inside the female animal. Gestation can also be described as time a fetus (or baby) grows and develop inside the mother. A fetus grows and develops in the womb during gestation.

What is Gestation Period?

Gestation period is defined as the time interval of a gestation. It is how long a woman or animal is pregnant or carrying a baby inside her. Gestational Age is the term used to determine the level of development or advancement of pregnancy. Gestation age is measured in weeks. Gestational age is subdivided into two stages, which are the Embryonic Period and the Fetal Period. The expected day in which a woman or animal is expected to give birth after being pregnant is known as the Due Date.

Gestation period varies in different animal species and is determined by the characteristics of the species. The table below shows the gestation periods of some animals.

Gestation Periods for Some Mammals

AnimalGestation PeriodAnimalGestation Period
Aardvark213 daysClouded Leopard70 days
African Bush Elephant20 – 24 monthsCoyote63 days
African Civet60 – 70 daysDeer (Mule and White-tailed)200 days
African Forest Elephant22 – 24 monthsDog62–64 days
African Palm Civet64 daysDolphin12 months
African Wild Dog70 daysDonkey365 days
Amur Leopard90 – 105 daysElephant660 days
Anteater190 daysElk, Wapiti255 days
Antelope8 monthsFerret42 days
Arctic Fox52 daysFox52 days
Arctic Hare53 daysGiraffe425 days
Arctic Wolf63 daysGoat150 days
Armadillo4 monthsGorilla270 days
Asian Elephant19 – 22 monthsHare36 days
Asian Palm Civet64 daysHippopotamus240 days
Asiatic Black Bear6 – 8 monthsHorse335–342
Aye Aye170 daysLeopard95 days
Baboon170 daysLion108 days
Bactrian Camel390 – 410 daysMarmoset150 days
Badger42 daysMink 41–75 days
Banded Palm Civet64 daysMonkey (Macaque)180 days
Bandicoot12 daysMoose235 days
Bat3 – 4 monthsMuskox255 days
Bear215 daysMuskrat29 days
Beaver122 daysNutria, Coypu130 days
Bengal Tiger3 – 4 monthsOpossum12 days
Binturong92 daysOtter270 – 300 days
Bison285 daysPanther90 days
Black Rhinoceros16 monthsPig114 days
Blue Whale11 – 12 monthsPorcupine210 days
Bobcat60 – 70 daysPronghorn250 days
Bongo9 monthsRabbit31 days
Bonobo240 daysRaccoon63 days
Bornean Orangutan9 monthsReindeer225 days
Borneo Elephant22 monthsRhinoceros (African)480 days
Bottlenose Dolphin12 monthsSeal330 days
Brown Bear180 to 266 daysSheep150 days
Buffalo11 monthsShrew20 days
Camel365 – 400 daysSkunk63 days
Capybara150 daysSquirrel (Gray)40 days
Caracal68 – 81 daysTapir390 days
Cat63 – 67 daysTiger103 days
Chamois5 – 6 monthsWalrus450 days
Cheetah3 monthsWhale (Sperm)450 days
Chimpanzee236 daysWolf63 days
Chinchilla111 daysWoodchuck31 days
Chipmunk30 days

Animal Gestation

Zoology, a biological discipline that is in charge of the study of animals, defines animal gestation as the process through which the female of the species, after being fertilized, is capable of carrying a fetus within a structure specialized in its womb and to support it until the moment of birth. This fetus receives in the womb the nutrients and oxygen it needs for the development and maturation of all its organs. In the initial stage of its development, it is called an embryo, after a few weeks this embryo is renamed a fetus until birth occurs and it is called a neonate or baby.

Animals that carry their young inside them before birth as described above are called Viviparous Animals. The vast majority of mammals, including humans, are viviparous, as well as some types of fish, reptiles, insects and amphibians. The most advanced form of pregnancy is called placental viviparism, and it is one in which an attached organ called the placenta develops, which is responsible for satisfying the fetus’s needs for breathing, feeding, and excretion. There are viviparous animals such as mammals that are capable of having multiple pregnancies, which means that more than one young can be born at the end of each gestation.