Warning: this story contains a graphic image of culled birds. Yet according to interviews conducted with four farm workers, the actual numbers for this current outbreak of avian flu are nearly twice that — 15 mega-farm have slaughtered closer to 3 million infected or potentially-infected birds.  Read MoreAvian Flu: Full CoveragePoultry Producers Use ‘Most Inhumane Method’ to Kill Birds Exposed to Avian FluAvian Flu Could Hit Latin America Next, Shorebird Researchers Warn