leaders of the pack. it seemed like it was a mommy, a daddy, and a baby buffalo. and they were upwind so they did not smell the lions. they couldn't see them in the grass. so they kept on going. >> he's enjoying himself and he has his nose in the air, but he wasn't smelling the lions. >> but the lions catch the musky scent of dinner. their thick muscled legs tighten. >> they're crouching. >> the big cats are perfectly camouflaged. >> and he's looking like he doesn't have a care in the world. >> that is a huge buffalo. >> huge buffalo. >> the lead buffalo, also called a bull, is a male, one of the largest and strongest in the herd. he is strolling along when suddenly his survival instinct kicks in. >> finally, the lead big buffalo understands that there's danger. he turns on a dime and starts running back. >> the herd catches on and starts a stampede. witnesses say the noise is deafening. >> i saw a lion come into view to the right, pass the other