Host Luke Burbank and announcer Elena Passarello talk birds of all kinds this week; writer Matthew Gavin Frank discusses the controversial world of diamond-smuggling pigeons; filmmaker Davy Rothbart and his subject Cheryl Sanford unpack 20 years of filming her family in their documentary 17 Blocks; and musicians Andrew Bird & Jimbo Mathus, former bandmates of the Squirrel Nut Zippers, perform "Sweet Oblivion" from their collaborative album These 13.