Tusks are elongated, continuously growing front teeth that protrude well beyond the mouth of certain mammal species. They are most commonly canine teeth, as with pigs and walruses, or, in the case of elephants, elongated incisors. Tusks share common features such as extra-oral position, growth pattern, composition and structure, and lack of contribution to ingestion. Tusks are thought to have adapted to the extra-oral environments, like dry or aquatic or arctic. In most tusked species both the males and the females have tusks although the males' are larger. Most mammals with tusks have a pair of them growing out from either side of the mouth. Tusks are generally curved and have a smooth, continuous surface. The male narwhal's straight single helical tusk, which usually grows out from the left of the mouth, is an exception to the typical features of tusks described above. Continuous growth of tusks is enabled by formative tissues in the apical openings of the roots of the teeth.
关于Tusk
Horror comedy film that follows a podcaster who travels to remote Canada to interview a reclusive old man with wild life stories. He quickly finds himself in a nightmare with a man who is obsessed with a Walrus. The movie was written and directed by Kevin Smith.
Tusk的成就
Filming took place in North Carolina. Smith at one point sought director Quentin Tarantino for a cameo appearance but he turned down the offer.
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Fang, a long canine tooth (in mammals).. Ivory trade - The ivory trade is the commercial, often illegal trade in the ivory tusks of the hippopotamus, walrus, narwhal, mammoth, and most commonly, African and Asian elephants. Ivory has been traded for hundreds of years by people in Africa and Asia, resulting in restrictions and bans.. Eco-economic decoupling - In economic and environmental fields, decoupling refers to an economy that would be able to grow without corresponding increases in environmental pressure. In many economies, increasing production currently raises pressure on the environment.. Ivory.. Bone products.. Mammal anatomy.
