SIOUX COUNTY, Iowa, May 31 -- People for the Ethical Treatment of Animals issued the following news release: Following the news that a local egg factory farm will kill 4.2 million chickens due to a bird flu outbreak--the largest flock affected by the virus so far this year--PETA plans to place a sky-high warning near the plant reminding everyone that slaughterhouses and filthy, severely crowded sheds where chickens are confined in the egg industry are breeding grounds for a host of deadly patho  more