Conservation photographer Paul Nicklen has been documenting the wildlife in the arctic regions of the world for decades, often getting dangerously up close with the animals he encounters in the sea and on land.
National Geographic contributing photographer Joel Sartore is 11 years into a 25-year endeavor to document every captive animal species in the world using studio lighting and black-and-white backgrounds. So far, he's photographed 6,500 different species, which leaves approximately 6,000 to go.
Robert Sullivan's Rats: Observations on the History & Habitat of the City's Most Unwanted Inhabitants chronicles the year he spent studying alley rats in New York City. He says you'd be surprised at what picky eaters they can be.
Alastair Fothergill and Mark Linfield are the directors behind the hit nature-documentary series Planet Earth. Their new movie, Earth, uses some of the same footage — but it's "character-based" rather than "habitat based."
Alex the African gray parrot could do more than speak and understand he could also count, identify colors and develop an emotional relationship. When Alex died in September 2007, his last words to scientist Irene Pepperberg were "You be good. I love you."