Animal rights protesters link arms to block an intersection in the central business district of Melbourne, Australia, on Monday. Ellen Smith/Reuters hide caption
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Pigs stand in their shed in a farm in Iowa. A judge Tuesday threw out a law banning undercover investigations in Iowa agricultural facilities. Nati Harnik/AP hide caption
Zoo visitors look at protesters and mourners from a walk bridge during a vigil for the gorilla Harambe outside the Cincinnati Zoo & Botanical Garden. John Minchillo/AP hide caption
Pigs gather in a sty at the Sierra de las Villuercas processing plant in October near Deleitosa, Spain. Denis Doyle/Getty Images hide caption
Author Barry Estabrook says pigs can be taught to play computer games and recognize themselves in a mirror. W. W. Norton & Company hide caption
Not all cows get to spend their days with soft green grass under hoof. For many, the picture isn't so pretty, according to the book Farmageddon. Justin Sullivan/Getty Images hide caption
The drone in Potter's promotional video on Kickstarter. "Now I'm looking at other models (and a second drone) because some people have threatened to shoot it down," Potter says. via Kickstarter hide caption