Across the planet carnivores are struggling to compete in a world with a rocketing human population, but one predator is bucking the trend-the fox. Its numbers are increasing and its geographical range expanding. Chris Packham explores the secrets to its success-its senses, its intelligence, and its flexibility. New research reveals how its slit pupils enable it to hunt in the bright desert day; how it may be using the Earth's magnetic field to determine the location of prey during a pounce; and how regular exposure to rotting food is improving the health of the red fox, enabling it to hold its own in an increasingly urban landscape. A BBC Production.

Originally released by BBC Worldwide Ltd, 2014. Streaming video file encoded with permission for digital streaming by Infobase on June 03, 2015.

Foxes: Introduction --(2:01) -- Fennec Fox and Tibetan Sand Fox -- (3:10) -- Slit Pupil -- (2:35) -- Red Fox -- (3:59) -- Arctic Fox -- (2:43) -- Arctic Fox: Summer Foraging -- (2:53) -- Arctic Fox: Seasonal Adaptations -- (1:43) -- Urbanization Opportunity -- (3:39) -- Urban Fox Diet -- (2:37) -- Red Fox Adaptability -- (2:14) -- Credits: Foxes -- (0:33).