Nat Geo WILD sails around the world to reveal what happens when nature's fiercest shore dwellers turn on their own kind, as we expose the coastline's toughest and meanest animal fights. Home video footage and stunning HD, combined with super slow-mo action replays, break down each battle in striking detail -- from the moment a polar bear aims its massive jaw at a rival's neck to incredible images of shark embryos fighting for their lives inside their mother's womb.