Then, after a gestation period of 180-270 days, the mother gives birth in the den, usually while still hibernating. However, some polar bears have shorter intervals of two years instead. The total gestation period is about eight months. The gestation period for human babies lasts nine months. REPRODUCTION: The female is in estrum for 3–4 days every 2 months, starting from the age of 18–19 months, and sometimes later. Grizzly bear gestation is between 5 to 8 months. I’ve heard that black bear sightings are on the rise in Dutchess County. Spectacled bears gestate for 5.5-8.5 months. Gestation refers to the period when the unborn organism is still inside the womb and is developing until the organism is born. After a gestation period of 63–75 days it gives birth to one to three (occasionally four) cubs in a den on the ground, in grass, bushes, or a fallen hollow tree. But how long does the gestation period last in animals? Thus the horse, a spring breeder with 11 months’ gestation, has its young the following spring, as does the sheep, a fall breeder with a five months’ gestation. The word "gestation" comes from the Latin "gestare" meaning "to carry or to bear." Animal Gestation Period Chart That Will Leave You Stunned. Sun bears gestate for 3-6 months. How can I avoid contact with bears? There are usually one or two cubs, sometimes three, but litters with four cubs are also not unheard of. Larger animals usually have longer gestations than smaller animals. The typical gestational period for the species is roughly eight months. Asian black bear 6-8 months with delayed implantation. For example Elephants have a gestation period of 22 months where as polar bears one of only 8 months. by Vaughn Aubuchon: Here is a pregnancy period comparison chart of human babies, selected pets and other mammals.. - The length of a human pregnancy is usually referred to as "9 months" for a baby, which is not completely accurate. The cubs are born into the winter den in January–February. It is a well-known fact that gestation period in human beings extends up to nine months. The breeding period of black bear takes place during summer. The normal gestation period in dogs is approximately 63 days from conception, although this can vary by several days. That’s nearly two years. The duration of this period varies between species. REPRODUCTION: The female is in estrum for 3–4 days every 2 months, starting from the age of 18–19 months, and sometimes later. For mammals the gestation period is the time in which a fetus develops, beginning with fertilization and ending at birth. For polar bears, intervals between births usually are around three years. The breeding season begins towards the end of … AnimalSake gives you a list of the gestation period of various animals. Gestation Period For Cows & All Other Mammals. The life expectancy of an American black bear is 10 years. Grizzly Bear Facts. The gestation period for a cow is about nine months long. That’s nearly two years. The females start their breeding when they reach 3 to 4 years old. The gestation periods of the animal kingdom are varied and fascinating. For example a human has a gestation period of nine months and a chicken has a gestation period of 3/4 months. This article provides some information on the length of gestation period as well as its stages. Some clock in at just a few weeks, making any human green with envy, while others can last more than a year. During this time she will enter a state similar to hibernation.