Story continuesThe United States, Britain, France and Japan are among countries that have suffered record losses of poultry over the past year, leaving some farmers feeling helpless. Poultry in the Northern Hemisphere were previously considered to be most at risk when wild birds are active during spring migration. So far, more than 1.1 million birds have died, the ministry said. Some experts suspect climate change may be contributing to the global spread by altering wild birds' habitats and migratory paths. Farmers are trying unusual tactics to protect poultry, with some using machines that make loud noises to scare off wild birds, experts said.