Arctic spring (March and April) is the mating period for polar bears, which usually lasts about two weeks, sometimes up to a month. Sexually mature female polar bears (over 4 years old) and male polar bears (over 5 years old) may have come to meet each other due to fate or telepathy. After meeting, the two parties can walk together on the crystal clear ice cap. Sometimes, the petite female bear walks in front, followed by the sturdy male bear, less than two or three steps away. Sometimes, due to love, the two parties get very close. Of course, sometimes a female bear is dissatisfied with a male bear. At this time, the male bear will often take violent actions, and the two parties will fight. But how can a weak female bear be the opponent of a large and strong male bear? , in the end, the female bear was not only bruised and bruised, but also had to be submissive and had to become a bride against her will. In a sense, although what the male polar bear does is a bit rough, it is extremely beneficial to the reproduction of the entire species. Because once the mating period is over, both parties will go their separate ways and live a single life. Moreover, they are forced by life to run around all day long. It is difficult to have a chance to meet again. And the mating period is fleeting. If you don't take advantage of this, The good opportunity to breed offspring may have to be postponed for another year, and it is difficult to predict whether this opportunity will be available at this time next year. Therefore, in order to ensure that the species continues for generations and does not become extinct, it is wise for male polar bears to seize every opportunity to reproduce. In the middle of winter (from December to January of the following year), female bears give birth in the caves they built. They usually give birth to twins, but occasionally they give birth to singles or triples. The newborn bear cub is naked, has black eyes, and no sound in both ears. It weighs only a few hundred grams, which is equivalent to about 1% of the female bear's weight. After birth, it grows very fast. After 3 to 4 months of breastfeeding, it can grow to 9 to 13.5 kilograms. Before that, the mother bear lived with her cubs day and night, inseparable, stationed in the cave, and relied entirely on the nutrients stored in her body to maintain her life, and she also had to nurse the cubs. The fat content of polar bear milk is as high as 30%, which is unmatched by any carnivore. Therefore, the bear cubs can develop well. After 3 to 4 months, the mother bear will leave the cave entrance with her cubs, let them go out to see the world and gain experience, and lead them back to the cave to spend the night. The cubs stay with the mother for about 2 years, during which time they have to learn to hunt and survive in the harsh Arctic environment. After reaching the age of 2, they begin to eclipse their power, and once they grow up, they rarely find companions of the same kind. They spend the whole day in the wind and snow, tossing between ice floes and land. Due to their special feeding methods and Considerable appetite (a polar bear's stomach can hold 50 to 70 kilograms of food). Therefore, it always walks alone and wanders, just like a lonely wanderer. When they reach 4 to 5 years old, polar bears reach sexual maturity and begin to marry, give birth, and establish a new home. Its reproductive age can last until 20 to 25 years old. At present, it is not possible to determine how long wild polar bears can live, but it is estimated to be 20 to 30 years. However, a captured polar bear once lived in a zoo for 40 years. However, only in zoos can polar bears have enough to eat and drink, and the management staff carefully raise and take care of them. They rarely get sick, and even if they do get sick, they will be treated, so that they can live a long life. If you are in the Arctic, those old polar bears often have poor vision and hearing, and their teeth are worn flat, making it difficult to catch prey. They are hungry, cold, and sick, and will die soon.