"Tusks are elongated, continuously growing front teeth, usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canine teeth, as with warthogs, pigs, and walruses, or, in the case of elephants, elongated incisors. In most tusked species both the males and the females have tusks although the males´ are larger. Tusks are generally curved, though the narwhal´s sole tusk is straight and has a helical structure. Continuous growth is enabled by formative tissues in the apical openings of the roots of the teeth. Prior to over hunting and proliferation of the ivory trade, elephant tusks weighing over 90 kg (200 lb) were not uncommon, though it is rare today to see any over 45 kg (100 lb)." - (en.wikipedia.org 28.02.2020)
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