A white stag or white deer is a red deer with a condition known as leucism that causes its hair and skin to lose its natural colour. The white stag has played a prominent role in many cultures' mythology.
Leucism is a rare genetic pattern that causes a reduction in the pigment of an animal's hair and skin. The natural colour of the red deer ranges from dark red to brown. They are often thought to be albinos; however, unlike albinos, who have characteristically red eyes, deer with leucism have normal colouring in their eyes. It is distinguished biologically from albinism in that it causes a reduced pigmentation in all skin types, and not just melanin.
Myth and legend
White deer hold a place in the mythology of many cultures. The Celtic people considered them to be messengers from the otherworld; it also played an important role in other pre-Indo-European cultures, especially in the north. The Celts believed that the white stag would appear when one was transgressing a taboo, such as when Pwyll trespassed into Arawn's hunting grounds. Arthurian legend states that the creature has a perennial ability to evade capture; and that the pursuit of the animal represents mankind's spiritual quest. It also signalled that the time was nigh for the knights of the kingdom to pursue a quest.
In Christianity, the white stag was partly responsible for the conversion of the martyr Saint Eustace. Eustace saw a vision of Christ between the stag's antlers and was told that he would suffer for Christ.
The white stag has also been invoked in contemporary society for its symbolism. Robert Baden-Powell, founder of the Scouting movement, spoke to Scouts at the 1933 World Jamboree in Gödöllő, Hungary, about the white stag:
The White Stag has a message for you. Hunters of old pursued the miraculous stag, not because they expected to kill it, but because it led them in the joy of the chase to new and fresh adventures, and so to capture happiness. You may look on the White Stag as the true spirit of Scouting, springing forward and upward, ever leading you onward to leap over difficulties, to face new adventures in your active pursuit of the higher aims of Scouting.—Baden-Powell's farewell speech to the Scouts, 
Today, the Hungarian branch of Scouts uses the white stag as a symbol. The white stag is also prevalent in Hungarian mythology; it was believed that a white stag led the brothers Hunor and Magor to Scythia, an action which preceded the formation of the Hun and Magyar people. The White Stag Leadership Development Program bases much of its spirit and traditions on the white stag of Hungarian mythology.
Reasons for symbolism
The colour white has long been associated with purity; and in Celtic culture, the colour also represented the otherworld. In modern society, people have acted to protect the white stag as a vestige of beauty, and the hunting of the white stag has often met with anger, because of its rare and elusive nature. White can also mean a symbol of peace or a truce.
In works of fiction
The white stag of Hungarian mythology was the subject of a children's book of the same name. The White Stag by Kate Seredy won the prestigious Newbery Medal as the Outstanding American book for children in 1938. This story describes the leadership of Attila—known by history as Attila the Hun, the "Scourge of God"—in their pursuit of a mythical white stag that led them to a new country and home.
The white stag played an important role in C.S. Lewis' The Lion, the Witch and the Wardrobe novel. The white stag makes two appearances, distinct from each other: it pulls the reins of the White Witch, but is also responsible for leading the children out of Narnia. It has been suggested that this is a comment on the duality of good and evil. Also, anyone who catches a white stag will be granted wishes.
The white stag makes an appearance in The Elder Scrolls V: Skyrim, in which a large white stag is hunted as part of the quest "Ill Met by Moonlight".
The Myth of the White Stag is the theme of the second episode in the second season of the Black Butler anime.
The White Stag makes an appearance in Harry Potter as a Patronus Charm used by Harry Potter's future self to guide Harry. Harry's father is also known to use the same Patronus.
The White Stag, known as Malorne, is a demi-god of nature in the Warcraft series of PC games.
It appears before the moment, hero meets the Dryad in a PC game Quest for Glory
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- All About White Sensational colour