'National Geographic' photographer Joel Sartore is on a mission to document every captive animal species in the world. So far he's photographed about 6,500 species. He talks about some of the challenges he faces on the job, like getting an arctic fox to hold still, and being chased by elephants. Also, we remember actor Bill Paxton who died this past weekend. Paxton starred in HBO's 'Big Love,' and in the films 'A Simple Plan,' and 'Titanic.' He spoke with Terry Gross in 2002.