How annual bird migration could spread avian flu by Reuters

Scientists are trying to understand how a virulent bird flu spread through farms in the United States, but one pattern is clear: poultry and cows risk exposure to sick wild birds migrating across the Americas.

Through detailed maps and illustrations, this piece shows the seasonal migration patterns of birds and their interactions with poultry farms. We highlight how migratory routes overlap with agricultural areas, increasing the risk of virus transmission to livestock.