In a world where only the fittest survive, millions of years of evolution have equipped a lucky few with extreme adaptations and formidable features.

  The secrets of animals revealed, from lizards walking on water to immortal jellyfish. Experts explain animal behavior, from how hippos can move faster through water than an Olympic swimmer to why cats have whiskers.

  In the Outback, Coyote and his crew set out to find three iconic gecko species. As night falls, Coyote begins his search to examine the nocturnal insect predators.

  Dr. Jeff makes a shocking discovery when a rescued street pup named Kova comes in witha severely injured leg.

  Everybody loves squirrels, and yet we only know them from their brief visits to ground level. This documentary examines their intelligence and explores the deadly struggle for dominance between the two main species – the cute and cuddly Red Squirrel and Grey squirrel.

  A once-in-a-lifetime, action packed adventure through Africa's last untamed, majestic wildernesses.

  Fisherman and adventurer, Jeremy Wade, travels to Alaska to discover what has happened to the king salmon – the power athletes of the salmon world.

  Considered the Jewel of Central America, Costa Rica is one of the most diverse places on earth.