🦆 Scientists are still trying to understand exactly how a virulent bird flu is spreading through farms in the United States, but one pattern is clear: Poultry and cows risk exposure to sick wild birds migrating across the Americas.   One way to understand the relationship between migrating birds and agricultural livestock is to look at the path of the mallard duck which has the most recorded avian flu infections.   🔗 Learn more about the top infected birds in the U.S. and how the disease is being spread through the seasons at our link in bio.   #Reuters #birdflu #avianflu #ducks #birds #livestock #agriculture #food #farms