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COPYRIGHT 2005 Natural History Magazine, Inc.
In the first chapter of his Origin of Species, Charles Darwin argued that if you wanted tangible evidence for evolution, you need look no further than the family pet. "Artificial selection" among domesticated animals, he noted, had resulted in extraordinary variations in a relatively short time, and "natural selection," Darwin explained, would work in much the same way.
To get some sense of how much variation exists among those of the canine persuasion today, visit the Web site of the American Kennel Club (www.akc. org). The site lists entries for...
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