A sudden strike turns a location scout into a race against death, and a personal trainer becomes the victim of an apex predator stalking the trails.

Communing with nature has its risks. You can end up on the menu or coming between a mom and her calves. In either case, your life is on the line.

Bites come in all shapes and sizes—from miniscule to massive—but all can take a life. Surprisingly, the cure can be just as dangerous.