Episodes

EXPIRING SOON
S34 Ep12
Snow Chick
Snow Chick
During two months of blizzards and frigid temperatures dipping to -80 degrees, each male Emperor penguin who breeds in Antarctica must nurture and protect a single egg that harbors his offspring. But once the eggs hatch by midwinter, these dads are ready to move on to their next stage of parenting. Snow Chick imagines the story of the youngest and last chick of the colony to emerge from his shell.
Premiered February 24, 2016
Video expires January 22, 2020
S25 Ep12
Dogs That Changed the World: Dogs By Design
Dogs That Changed the World: Dogs By Design
Passport
The second hour of "Dogs That Changed the World" details the explosion of the basic working dog types into the roughly 400 breeds known today; explores concerns about today’s competitive breeding and its effect on dogs’ health and well-being; and outlines dogs’ potential role in medical care for human beings.
Encored October 12, 2011
Premiered April 29, 2007
S25 Ep11
Dogs That Changed the World: The Rise of the Dog
Dogs That Changed the World: The Rise of the Dog
This film explores how the domestication of dogs might have taken place, including the theory of biologist Raymond Coppinger that it was the animals themselves — and human trash — that inspired the transformation. The genetic analysis of Peter Savolainen of the Royal Institute of Technology in Sweden has placed the origins of domesticated dogs — and those of the first dog — in East Asia.
Encored October 22, 2011
Premiered April 22, 2007
Video expires January 31, 2020
S25 Ep10
Voyage of the Lonely Turtle
Voyage of the Lonely Turtle
Spinners dolphins congregate in superpods of hundreds, coordinating a hunt – and spinning! Scientists do not know for certain why they spin.
Encored April 14, 2007
Premiered April 15, 2007
S25 Ep7
Raptor Force
Raptor Force
Take flight on an exhilarating ride with elite winged predators. Humans have had a unique relationship with raptors, nature’s aerial killing machines, for more than four thousand years, first through the ancient sport of falconry, and, more recently, as scientists and engineers have turned to these mighty birds for inspiration for the latest in aircraft design.
Premiered February 18, 2007
S25 Ep5
Rhinoceros
Rhinoceros
Passport
During the past century, the rhinos of Africa and Asia have been pushed out of their habitats and hunted nearly to extinction for their horns, which are believed — erroneously — to possess healing properties. Now, thanks to the efforts of conservationists and scientists, the rhinos are on their way back.
Encored September 6, 2016
Premiered January 28, 2007