White Tigers - Freaks of nature

What you see here is the byproduct of breeding white tigers.

wiki
Because of the extreme rarity of the white tiger allele in the wild, the breeding pool is limited to the small number of white tigers in captivity, which additionally all descend from a common ancestor. Inbreeding between these tigers often leads to defects. Due to the high market value for white tigers, unscrupulous breeders will still inbreed white tigers to ensure the offspring also exhibit the recessive gene. Some animal rights activists have called for a halt to the breeding of white tigers altogether.

This ties in nicely with dekus' previous post.