ARCTIC CATS AND BUFFALO

YELLOWSTONE MAY NOT BE BIG ENOUGH FOR BOTH ITS GROWING HERDS OF SNOWMOBILERS AND ITS BISON

John and Susan Purcell toured Yellowstone this winter the new, noisy way--by snowmobile. And like thousands of visitors who clamber onto winter scooters every week to explore America's oldest national park, they can't get over those close encounters with wild elk, moose, trumpeter swans, coyotes and, closest of all, buffalo. The huge, hairy beasts--some weighing as much as a Volkswagen--ambled right down the middle of the road, often forcing drivers to hit their brakes to avoid a meaty collision. "We got within 5 ft. of them!" says an excited John Purcell. "I've never seen so many bison."

And that's a problem--as...

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