David Yarrow’s awesome black-and-white images practically beg for a bit of background. How did he get right in front of the world’s largest elephant? Or close enough to a polar bear to capture its epic mid-swim headshake? In this podcast, and with a charming Scottish accent, the wildlife photographer offers no-frills, no-nonsense, yet totally illuminating explanations, placing listeners in his globe-traveling shoes. A picture tells a thousand words, but these days, might as well make it a thousand-plus. —J.V.