"Imagine it's morning. You wake up and you are totally alone. You're 90 years old, and you're the last of your kind on earth."

This is the opening line of F. Abraham Murray's naration PBS's "The Loneliest Animals." The video footage of "Lonely George," the last known tortoise in the Galapagos Islands, is quite stirring, craning his 90-year-old neck in search of his next meal.

George is but one of many nearly-extinct animals on the planet, several of which are featured in this moving documentary. You can watch the entire episode here.

"The loneliest animals are the most endangered species on the planet," says the show's web page. "Collected and protected by dedicated scientists, these animals represent the end of the line for their species. In many cases, intensive captive breeding programs have been launched with the aim of sustaining these animals and the hope of returning them to the wild. Viewers will be taken into high-security, high-tech labs where scientists attempt to breed new generations, and into the field to discover what forces have led to the demise of entire species. Featured animals include Yangtze turtles under 24-hour surveillance; a baby Sumatran rhino; a special collection of lemurs; the Spix’s macaw, a bird declared extinct in the wild in 2000; and “Lonesome George,” a giant tortoise from the Galapagos, who is the last of his kind."

The soundtrack for this episode was written and performed by my friend, Gary Pozner, Emmy-nominated composer (Russia: Land of the Tsars). If you have a chance to watch the episode and you like the music (which I know you will!), please take a moment to let the station know by leaving a comment, which you may do right below the video feed on the site.