The avian flu is devastating poultry farms in California, with nearly a million birds being slaughtered to control the outbreak. The virus has spread to Sonoma County and Merced County, causing economic damage to farmers and workers. Experts say the virus is spread by migratory birds, and poultry farms are implementing strict biosecurity measures. The outbreak has led to a spike in egg prices, and the poultry industry is concerned about the growing number of backyard chickens that could become infected. Climate change is increasing the risk of outbreaks as changing weather patterns disrupt migratory patterns of wild birds.