It's known as the only national park in the world with a skyscraper skyline. Nairobi National Park, in the Kenyan capital, boasts elephants, giraffe, rhinos and lions roaming freely across a savannah a mere 4-mile drive from downtown. But last night, the proximity of urban and natural environments got a bit too close. Up to six lions escaped the confines of the park and were seen wandering in a residential area. Kenya Wildlife Service officials expressed bafflement Friday when reporters asked them how the lions escaped. Nairobi residents shrugged. Escape? This is not a zoo, people. More like the lions ... strayed. Although the park is bounded on three sides by an electric fence, the southern side of the park is open. Animals use that passage to follow their natural migration routes. Before daybreak, park rangers were tracking the lions with tranquilizer guns — and toll-free numbers. They traced the lions into Kibera, one of the world's largest slums. "I hear there are lions on the
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