Are bison and other animals fleeing Yellowstone National Park in record numbers because they sense an impending eruption of the park’s supervolcano Yellowstone Caldera? That’s the theory being tossed around by a number of bloggers who cite recent seismic activity, including a magnitude 4.8 quake that rattled the park near the Wyoming-Montanta border on Monday, just days after a magnitude 5.1 temblor was felt by an estimated 17 million people over a large swath of Southern California. MORE