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Polar Bear Thalarctos Maritimus Conception After trailing behind the Female Polar Bear for about two months the male Polar Bear then mates with the female Bear Females are induced ovulators which means the act of mating causes a female to release an egg for fertilization polar bears alive Fertilization takes place internally Several days of mating interactions may be required to stimulate ovulation and guarantee fertilization of the egg In doing so it starts the gestation period Gestation Period The total gestation period is about eight months During gestation the fertilized egg divides into a hollow ball of cells one layer thick then the ball stops growing and lies free floating in the uterus for about four months The cells then implant in the uterine wall and continue to developSea World Delayed implantation assures that the cub is born during the best time of the year for survival and allows the female to get into good physical condition and uses her energy for nursing her new born cubsSea WorldThe actual embryonic development is estimated to be four monthsSmithsonian Institution Birth Most adult females give birth once every three years Sea World states that at birth polar bear cubs weigh about 454 to 680g and are about 30cm long however Bears Den states that at birth the young weigh about 450g The fur is fine at birth making the cubs look hairlessSea World Female polar bears go through a period called Denning when they are pregnant in which they begin depositing fat They need to gain at least 441 pounds while pregnantWorld book encyclopedia Usually they dig dens in snowdrifts on southern facing slopes Some dig earthen dens that later become covered by snow Most dens
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