Rodd Houston

South America is a continent of contradictions, born of fire and carved by the mighty Amazon River. This is a detailed look at the wonders of South America, through its stunning landscapes. With everything from massive glaciers to dry deserts, and everything in-between.

From the North Pole to remote islands, birds can live almost anywhere. How do these resilient animals thrive in such different environments? They have become hardy and versatile through their bodies, feathers, movements, and songs. In this global birding tour, we learn about these nomads of the sky.

Threatened by the guns of Southern Africa's farmers, black-backed jackals have found shelter in a new but arid area, Namibia's Skeleton Coast.

A collection of highlights from the triumphant 2007-2008 basketball season, in which Paul Pierce, Ray Allen and Kevin Garnett did their bit to take the Boston Celtics to the top of the NBA, ending their 22-year title drought with a six-game victory over the Los Angeles Lakers.

The dog is the ultimate human creation. With 400 breeds and counting, the dog is more varied in size and behavior than any other species on the planet. National Geographic looks at man's evolutionary manipulation of dogs' appearance, talents and temperament - and the accelerating efforts to create breeds to suit our needs (more than 80 percent of today's breeds did not exist 150 years ago). From desirable traits like supersensitive hearing and smell to the unintended consequences of genetic diseases, learn how nature and man have partnered to deliberately create new and specialized versions of man's best friend.

Covers the final moments of the passengers and crew on board United Airlines Flight 175, which was the second commercial airliner to strike the World Trade Center, impacted with the South Tower, and was the most visually documented (both photographed and filmed) flight during the September 11 attacks.

Shark biologist Marcus Drymon unravels the mystery of the songbird-eating shark.