Slideshow: PETA’s crusade against animal research

Since its founding in 1980, People for the Ethical Treatment of Animals (PETA) has sought to end animal research. Its tactics have changed over the years, as have its targets, which have broadened to include fast food, factory farms, and the cosmetics industry. As PETA shifts gears yet again—launching a new campaign to target animal research by publishing in peer-reviewed scientific literatureScience looks back at its 4-decade crusade.