A wild boar at at an enclosure set up by forest rangers in a northwestern district of Berlin in 2017. Denmark is building a $12 million fence in an effort to keep out wild boars from Germany.
Tobias Schwarz/AFP/Getty Images
A hog gets a closeup at the Illinois State Fair in August. Officials took special precautions to make sure no livestock sick with a new strain of swine were part of the fair.
Students at a University of London class in Mexico City wear masks to protect them against swine flu in May 2009. High schools and universities closed by the pandemic had just reopened across Mexico.