Shanthi explores her yard at the Smithsonian National Zoo in Washington, D.C., in 2010. The 36-year-old Asian elephant loves blowing into a harmonica.
Mehgan Murphy/Smithsonian Institution
A security guard opens the gate at the Central Valley Meat Co., the California slaughterhouse recently shut down by federal regulators after they received a graphic video of cows being mistreated.
A school of Blue Tang fish swimming together off the Caribbean island of Bonaire. It has long been assumed that the schooling behavior of fish evolved in part to protect animals from being attacked by predators.
David J. Phillip/AP