Why are giant pandas Leo and Virgo?

Female giant pandas are in estrus once a year, each time lasting only 2-3 days, and the estrus period is usually from March to May every year. Adult male and female pandas gradually gather in one place through olfactory communication (by leaving odor marks and odor marks), get to know each other and attract each other. At the climax of estrus, they express their love through continuous baa, birdsong, waiting posture and other auditory and visual communication ways, so as to achieve the purpose of pairing and mating.

There are sometimes as many as 2-5 male giant pandas who have successfully mated with the same female giant panda through fighting, and there are also cases where only one male has mated with a female giant panda. Mating is mostly on the ground, but also on trees. There are also sub-adult and weakly mated giant pandas watching and learning at the mating site. The estrus behavior of male giant pandas occurs with the estrus behavior of female giant pandas, and it also reaches its climax. In the same estrus, a male panda can mate with multiple females, and the same female panda can also accept the mating of multiple males, so the marriage in the panda world is polygamous. After mating, male and female pandas live separately again, and pregnancy, childbirth and rearing are all done by female pandas alone.

Giant pandas went from prosperity to extinction in millions of years. The reason is not only the deterioration of the external environment, but also the problem of its own fertility. According to the long-term study of anatomy, histology, physiology and endocrinology of giant pandas by relevant experts, the reproductive function of giant pandas is extremely low. Due to genetic and environmental reasons, the reproductive system of many giant pandas is seriously underdeveloped, and the reproductive endocrine function of adults is disordered, and they cannot ovulate or ovulate normally, or even become infertile for life. Giant pandas like to live alone and only want to have contact with the opposite sex after estrus. Female giant pandas are in heat only once a year, so they are very selective. Unless they meet Prince Charming, they won't throw hydrangeas. In the wild, males often have to compete through cruel fights, and the ultimate winner can win the favor of females. If there are not enough excellent males in a small population, it will obviously greatly reduce the chances of normal mating between males and females and reduce the pregnancy rate after mating. Most of the cubs of giant pandas are singletons, and even if they give birth to twins, they can only raise one. Giant panda cubs are very fragile, and they are easy to die due to nutritional deficiency, disease, bad weather or natural enemies.

Giant pandas mainly feed on bamboo, and it seems that they should be classified as "herbivores" in terms of feeding habits. However, according to the anatomical and physiological characteristics of the digestive tract and the viewpoint of species evolution, they are authentic carnivores.