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The animal on the cover of Learning Unix for Mac OS X Tiger is a Siberian tiger cub. Tiger cubs are born blind and weigh only about as much as a small domestic housecat. Litters average two to four cubs. They feed on their mother's milk for six to eight weeks (and remain blind for the first two), until their she begins to bring them solid food at the age of three months. After roughly a year, the mother tiger will begin teaching her young how to hunt. Cubs develop the lethal teeth of an adult and begin killing their own food when they are approximately 18 months old, but will remain with their mother until they are two to three years old. Once they are old enough and can ably take down large kills of deer, buffalo, and other prey, the tiger cubs must strike out to find their own hunting territory. The Siberian tiger can live up to 15 years in the wild.