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The animal featured on the cover of CGI Programming with Perl, Second Edition, is a mouse, a rodent of the family Muridae. True, or long-tailed, mice belong to the youngest group in the animal kingdom, approximately 15 million years old. Over 200 species of mice exist, but the most common is the house mouse. The house mouse is the second most widely distributed mammal on Earth, behind only humans. Despite their name, house mice often live in fields, but they usually live near human dwellings. House mice eat almost anything, but they prefer grains and grain products.