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The animals on the cover of Active Directory, Second Edition, are a domestic cat (felis silvetris) and her kitten. The domestic cat is a descendant of the African wild cat, which first inhabited the planet almost one million years ago. Other early forerunners of the cat existed as many as 12 million years ago.

The domestic cat is one of the most popular house pets in the world. There are hundreds of breeds of domestic cats, which weigh anywhere from five to thirty pounds, with an average of twelve pounds. The cat is slightly longer than it is tall, with its body typically being longer than its tail. Domestic cats can be any of eighty different colors and patterns. They often live to be fifteen to twenty years old; ten years for a human life is about equal to sixty years for a cat.

The cat’s gestation period is approximately two months, and each litter may contain three to seven kittens. Mother cats teach their kittens to eat and to use litter boxes. Kittens ideally should not leave their mother’s side until the age of twelve weeks and are considered full-grown at the age of about three years.

Darren Kelly was the production editor and Leanne Soylemez was the copyeditor for Active Directory, Second Edition. Mary Brady, Tatiana Apandi ...

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