Sy Montgomery and Elizabeth Marshall-Thomas are best friends who also happen to be ''New York Times'' best-selling authors. They first bonded over their shared love of animals: shortly after meeting, Sy's pet ferret had given Liz a nasty bite, but Liz didn't seem to mind at all. ''She REALLY didn't mind being bitten by a weasel. I knew we were soul mates,'' recalls Sy. ''Tamed and Untamed'' is the resulting collaboration between the two friends as they share personal anecdotes and amazing stories about the animal world.