Pink slime? Poultry beaks and feet? Former "MythBusters" host Grant Imahara visits Tyson food-processing plant to investigate what McDonald's Chicken McNuggets are actually made from. Is there pink slime in Chicken McNuggets? Does McDonald's use the whole chicken, the beak, the claws, the feet and everything else? Thanks to a new ad campaign, McDonald's is giving the public answers about its most popular menu item -- Chicken McNuggets .