There are now more cats than dogs in the United States (78 million cats vs. 65 million cats in 2003, according to American Animal Hospital Association and the American Pet Products Manufacturers Association). So, here are feline facts to amaze, delight and inspire anyone from the ailurophile to the casual cat fancier: • Kittens are born blue-eyed. If their eyes change colors, it generally occurs at 4 to 5 weeks of age. Kittens open their eyes at 7 to 10 days but can't hear until they're about 14 days old. • The cat is the only animal that purrs. Domestic...