How do kangaroos give birth to babies

Kangaroos give birth once or twice a year, and baby kangaroos are born about 30 to 40 days after fertilization. The newborn kangaroo has poor eyesight and is naked all over. Kangaroo mother will lick a "passage" on her fur, and the baby kangaroo will climb into the pouch along this "passage" until 6~7 months later, she will leave the pouch and come to the outside world to live and study.

Kangaroos mate in1-February. After the mating period, the female animals immediately live in seclusion and live a lonely life until giving birth. There is a strange "slowness" phenomenon in female animals after fertilization. When the fertilized egg of kangaroo divides into about 100 cells, if it encounters unfavorable conditions of dry climate, its development will stop and it will be temporarily sealed in the uterus. When the climate is suitable, the sealed embryo will re-develop and give birth in about 5 weeks. Because kangaroos have no placenta, all young embryos grow in the uterus for a short period of time and continue to develop in the female pouch.

When a female animal is in labor, usually two hours before giving birth, she will carefully clean up the sundries in the nursing bag, then sit down with her back against a tree and stick her tail out of her leg, waiting for the baby to be born. Kangaroos usually have a litter, and a few are twins. The newborn cub is very small, only 2.5 cm in size.

So, how do cubs get into the pouch? This problem has been bothering people. The fact is that the cubs climbed in by themselves. Although the newborn cub is small, its forelimbs have already grown claws. Under the control of nerves and muscles, they will crawl into the pouch along the tail of the female animal. As soon as he entered the pouch, he looked around for nipples, grabbed one of them and hung himself on it. So some people say that kangaroo cubs grow from nipples.

After growing up in a pouch 160 days, kangaroos will stick their heads out too much. After 200 days, it will leave the pouch and move outside. Kangaroos move under the protection of female animals and often go in and out of the pouch. It takes 3-4 years after leaving the pouch, and kangaroos grow up for several years.