Tusks can be used to send signals to other male narwhals. Tucks' message is simple, "I am stronger than you". Scientists call the physiological characteristics that can truly show the value of a partner "honesty signal". If this research continues, when a female narwhal chooses between two male narwhals with similar bodies, she will choose a male narwhal with bigger tusks as a true signal of quality, health and good genes.

This kind of tooth is unique among animals. Narwhal is a small toothed whale that lives in the deep waters of the Arctic Ocean. The male is 5m long and weighs 900 ~ 1600kg, while the female is slightly smaller. The male whale has two teeth in the upper jaw, but the left one grows in a spiral counterclockwise direction. The elderly can reach 3 meters, almost as high as two people. /kloc-Before the 0/7th century, western Europe always mistook teeth for horns, hence the name narwhal or narwhal. Among mammals, the elephant's ivory is the largest and most precious, but it is far less long and strange than the narwhal's teeth. This tooth is spiral, like a rubbing cylinder, as sharp as a lightsaber. It's just a sharp spear.

Because this kind of tooth is unique among animals, people used it as a magic wand in the past, and western Europe used it to make medicine, saying it was a panacea for all diseases, which made it mysterious, valuable and very expensive. It is said that the Roman Empire Charles V gave one-on-one narwhal teeth to two Germanic countries to pay off a large debt. 1559, the Venetians offered 30,000 Venetian gold coins to buy one of them, but failed. The princes regarded this tooth as a panacea. If someone in the family is dying, family representatives will get together to supervise the sawing of a bit from the tusk and give it to the patient.

Narwhals are actually called toothed whales because male narwhals have such mysterious tusks. Initially, a narwhal had 65,438+06 teeth in the embryonic stage, but these teeth seemed to have stopped developing. At birth, most of the teeth degenerate and disappear, leaving only two teeth on the upper jaw, while the female whale's teeth have been hidden in the upper jaw, and only one tooth on the left side of the male whale has broken its lip and stuck out of its mouth like a long pole.