There is a strange collection in the Scottish Museum of nature: a 45 cm long walrus bone with broken and healed marks in the middle. Although there is nothing strange about its appearance, it tells a sad and tortuous story. < / P > < p > the bone is so thin that it can be inferred that it came from a young walrus (the penile bone grows thicker and thicker all its life). It is speculated that when the male walrus fights for a mate, it accidentally presses more than a ton of weight onto the penis it is inserting, and then a tragic “geden” sound occurs But its male style did not end. The fracture healed later. In the wind and rain, this pain is nothing The penis bone is not a rare accessory in mammals. There are many species with penile bones in primates, carnivores (including land carnivores and walruses, etc.), rodents, bats, and some small insectivorous animals with similar appearance but not close relationship. Humans are different in this respect. Monkeys and apes living in the old world (Africa, Asia), including our closest relative, chimpanzees, all have this bone, but we don’t. So it’s not surprising that Tintin has bones. It’s strange that there is no such thing as We’ll talk about it later. The T-Bones of walrus are the largest among the living mammals. The length of the adult walrus can reach 60 cm, which is 1 / 6 of the body length. It’s so solid that it’s even used to make crafts – in Amsterdam, there’s a handle made of walrus Ding bone, which is carved with patterns. T-butyl bone is a rapidly evolving site with various morphologies, which can even be used as evidence to identify different species. Oryzomysspp And microtusspp In the shape of a very curious Trident, the ground squirrel (Spermophilus spp.) The end is flat and wide, and the edge is surrounded by a circle of thorns, like a hedge. Interestingly, the shape of this wonderful flower of ground squirrels may be consistent with the wrinkles inside the genitals of female ground squirrels. It is just a key that opens a lock. Second, stimulate ovulation. In some species, females are stimulated by mating to produce eggs. With the support of bones, males can stimulate females more effectively. < / P > < p > Third, prolong the time. In species where females mate with more than one male, males compete for the “right” of being a father. Therefore, in some species, after the sperm is excreted, the male will still insert it for a period of time, allowing the sperm to combine with the egg, leaving no chance for “Lao Wang”. The most typical is the dog. It can not only provide reliable support, but also protect the urethra and make the semen channel unobstructed. The first-hand information on the use of T-bone is very insufficient (it is estimated that it is difficult to collect), so now we mainly use the method of comparative study: collect the data of various animals’ T-Bones and their mating behavior, and then compare them, so as to speculate the function of T-bone. For example, assuming that the function of a Ding bone is to prolong mating time, the species with longer insertion times should have larger root bones. The process of testing hypotheses is often disappointing. Because of different animal groups, the comparison results are often different, so it is impossible to reach a unified conclusion. In primates and fin footed sea animals, species with long insertion time usually have relatively long Ding bones. For example, the dinggu of Macaca arctoides is five times larger than that of Cercocebus torquatus. However, the two species are similar in size, and even slightly larger in collared white browed monkeys. But terrestrial predators don’t have this pattern. Carnivores and rodents, females paired with more than one male, usually have longer Ding bones, but bats’ private lives have nothing to do with length. The reason why the results of comparative studies of t-butyl bone are so inconsistent may be that its origin is different. In the evolutionary history of mammals, dinggu appeared about 145-95 million years ago, appeared at least nine times in different evolutionary branches, and disappeared at least ten times. For example, in primates, dinggu appeared twice, once a primitive primate similar to a lemur, and once a monkey and an ape. In the monkey and ape branch, T-Bones are lost three more times. It was lost twice in Carnivora, once hyenas and once arctitis Binturong, a civet. Bats have even been lost five times. < / P > < p > that is to say, although it looks like a bone, the dinggu of different animals may have different evolutionary paths and their functions are likely to be different. It is too simple and crude to explain its use with a single hypothesis. The beaver is a very special animal. Although it has no bones in its Ding Ding Ding, it has bones in the clitoris of the female. < / P > < p > kit Opie and Matilda brindle of University College London put forward that this is determined by mating behavior. They used the hypothesis that T-bone was used to prolong mating time. The more mating partners a female has, the more intense the competition between males is, and the more they need to extend the insertion time to ensure that their sperm can arrive safely. In primates, the species that have this bone have a longer insertion time (more than three minutes) next to it. Although there are many forms of human mate, generally speaking, humans are more monogamous in mammals. There is less competition between men, so there is no need to insert for a long time. The average time of human insertion is less than two minutes. However, it has opened the door for countless superstitious activities and the harm of wild animals. In 18 years, three former staff members of Tianshou Tang pharmacy in Hong Kong, China, were charged by Tianshou hall for selling “seal whip”. The so-called seal whip is the male genitalia of seals, in which dinggu accounts for a large part. In order to protect wild animals, “seal whip” has been banned by law. But illegal hunting and selling are still prohibited. In fact, it is completely witchcraft to “fill the shape with shape”, and this bone can’t grow back any more.