Dead or Alive

A routine outing in the mountains of northern California turns violent when unsuspecting trail-goers cross paths with the region's most notorious predator: the cougar.

When an American Billionaire on a family safari and an amateur photographer holidaying with friends are attacked by elephants, their lives hang in the balance.

Hippos can be among the most aggressive and territorial creatures on the planet -- two groups of tourists learned this the hard way when a routine trip down Zimbabwe's Zambezi River leaves them fighting for their lives.

Nat Geo WILD details two brutal shark attacks -- one of them fatal -- that left victims stunned and local communities on edge. Revisit the tense moments through firsthand accounts and heart-pounding recreations.

Nat Geo WILD goes inside the harrowing accounts of two U.S. grizzly attacks that left one dead and others critically injured.