There are a number of animals that have extraordinary senses. Sharks for example can sense the electrical impulses of their prey submerged beneath sand.
Pit vipers have infrared pits which are clearly visible below and slightly anterior to the eyes. These allow it to strike at prey in total darkness. They also allow the snake to identify the size and distance of their target by virtue of the prey's body temperature.
If you could have been born with a sixth sense, what would you have chosen it to be?