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Ivory is a hard, white material from the tusks (traditionally from elephants) and teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks. The chemical structure of the teeth and tusks of mammals is the same, regardless of the species of origin, but ivory contains structures of mineralised collagen ...
Around 1160 northern European ivory carving was greatly reduced, which may well be because the material was less easily available. Around 1260, at the start of the Gothic period, elephant ivory began to reach Europe again, and the industry greatly increased. [4] The Norse also carved items in walrus ivory, notably the Lewis chessmen.
The ivory-bill is the largest woodpecker in the United States, and one of the largest in the world. Naturalist John James Audubon described it as the "Great chieftain of the woodpecker tribe". [7] In adults, the bill is ivory in color, hence the species' common name, and the plumage is deep black and white, with a red crest in males.
An African elephant in Tanzania, with visible tusks. 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 narwhals, chevrotains, musk deer, water deer, muntjac, pigs, peccaries, hippopotamuses and walruses, or, in the case of elephants, elongated incisors.
Ivory is a fragile medium; many 19th-century pieces were preserved because they were kept in a barrel of oil on board ship. Gary Kiracofe, a scrimshander in Nantucket, Massachusetts, advises collectors that if a piece looks dry, one should fill the center of the tooth with unscented baby oil and allow it to remain until as much oil as possible is soaked into the microscopic pores of the ivory.
Adult females have a dark brown cap and a narrower black band below the throat than males. [6] The nominate subspecies' bill is mostly yellow, with a deep red to brown line on the maxilla that is broad at the base and tapers to a black tip. It has red, black, and ivory markings along its edge that resemble teeth. P. a.
Gulls are typically grey or white, often with black markings on the head or wings. They have stout, longish bills and webbed feet. Terns are a group of generally medium to large seabirds typically with grey or white plumage, often with black markings on the head. Most terns hunt fish by diving but some pick insects off the surface of fresh water.
The body is black, the limbs and fingers are long and the tail is white. There is a fringe of silvery hair around the face as well as long white "epaulettes" on its shoulders. [5] The king colobus can be distinguished from other members of the Colobus genus by the placement of its white markings. The king colobus has white only on its whiskers ...