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White tiger

life science Maturity 7-9 Next article →

A white tiger is a leucistic morph of the tiger, most commonly the Bengal tiger subspecies, *Panthera tigris tigris*.

MadridZoo-Panthera tigris tigris
MadridZoo-Panthera tigris tigris

While they appear different from standard tigers, they are not a separate species. They possess the typical black stripes found on all tigers, but their coats are white or near-white. They are also characterized by having blue eyes. These tigers are highly valued in zoos and for exotic animal entertainment due to their rare appearance. However, their unique coloration is the result of a specific genetic mutation rather than a different biological classification.

The white coloration is caused by a lack of pheomelanin. This is the pigment that normally produces red and yellow colors in orange Bengal tigers.

Scientists once thought this was caused by a mutation in the tyrosinase (TYR) gene, which causes albinism. In albinism, a creature lacks both pheomelanin and eumelanin, the pigment for black and brown. However, research showed that white tigers have a normal TYR gene. Instead, a naturally occurring point mutation in the SLC45A2 transport protein gene is responsible. This mutation introduces an alanine residue into the protein's central passageway. This residue appears to block the protein, which prevents the expression of pheomelanin in the fur.

This trait is recessive, meaning it is only visible when an individual is homozygous for the mutation. To produce a white tiger, both parents must carry this unusual gene. In nature, this occurs in only about one in 10,000 births.

WhiteTiger25
WhiteTiger25

Because the trait is recessive, white tigers can be bred from colored Bengal tiger pairs if both parents possess a single copy of the mutation. In captivity, many people use intentional inbreeding to promote these recessive traits. While this produces white tigers, it also leads to various genetic defects. This practice is banned by the Association of Zoos and Aquariums for accredited institutions.

White tigers have a distinct history of documentation in India. Records of these animals date back to the 16th century CE. The first white tiger was captured in 1915. A famous white tiger named Mohan was captured in 1951 by the king of Rewa, Martand Singh. Mohan was found in the forest of Mukundpur, which is now part of the Sanjay Dubri Tiger Reserve.

Standing white tiger
Standing white tiger

Many white tigers in modern zoos are direct descendants of Mohan. The naturalist Kailash Sankhala reported that the last white tiger seen in the wild was shot in 1958. Currently, several hundred white tigers live in captivity worldwide, with approximately one hundred located in India.

Physically, white Bengal tigers differ from their orange counterparts in several ways. They tend to grow faster and become heavier than orange tigers. They also tend to be larger at birth and as adults. A white Bengal tiger reaches full maturity at 2 to 3 years of age. Male tigers can reach significant weights and lengths.

White Tiger 6 (3865790598)
White Tiger 6 (3865790598)

Interestingly, a tiger's stripes are like fingerprints. No two tigers share the same pattern because the stripes are a pigmentation of the skin. Even if a tiger were shaved, the pattern would remain visible on the skin.

Some tigers exhibit an even more extreme phenotype known as "snow-white" or "pure white." These individuals have very pale stripes or almost no stripes at all.

Whitetigermirage
Whitetigermirage

This condition can result from an additional genetic condition. The modern strain of these stripeless tigers originated from the repeated mating of Bhim and Susmita at the Cincinnati Zoo. About one-fourth of their offspring were stripeless. This stripeless trait has appeared in zoos in the Czech Republic, Spain, and Mexico. Some magicians also attempted to selectively breed for this specific look.

Being white comes with significant biological challenges. In the wild, the lack of orange fur reduces camouflage, making it harder to stalk prey. White tigers also face several health issues due to inbreeding. One notable condition is strabismus, or crossed eyes.

White Tiger Deformed
White Tiger Deformed

This is caused by a disruption in the optic chiasm, where the visual pathways in the brain are incorrectly routed. This makes spatial orientation difficult, often causing tigers to bump into objects. Other issues include shortened tendons, club foot, kidney problems, and crooked backbones. Some tigers also show a strange reaction to anesthesia, experiencing a re-sedation effect 24 to 36 hours later.

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🖼️ Images & Media (10)
File:Standing white tiger.jpg
Standing white tiger.jpg
File:MadridZoo-Panthera tigris tigris.jpg
MadridZoo-Panthera tigris tigris.jpg
WhiteTiger-TobuZoo2012.ogv
File:White tiger Nandankanan.jpeg
White tiger Nandankanan.jpeg
File:Whitetigermirage.jpg
Whitetigermirage.jpg
File:White Tiger Deformed.jpg
White Tiger Deformed.jpg
File:White Tiger 6 (3865790598).jpg
White Tiger 6 (3865790598).jpg
File:Siberian Tiger, Yerevan Zoo (2).jpg
Siberian Tiger, Yerevan Zoo (2).jpg
File:WhiteTiger25.jpg
WhiteTiger25.jpg
File:Panthera tigris tigris, Liberec.jpg
Panthera tigris tigris, Liberec.jpg
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