Sea Shepherd crew hurl bottles of butyric acid at Japanese harpoon ship, the Yushin Maru No. 1, on Monday, Feb. 2, 2009 during a clash in Antarctica's Ross Sea. 'Rotten butter bombs' were aimed at the whaling ship's deck in the hope of making work onboard difficult, and tainting meat to be sold at market. While Sea Shepherd claims non-violence, its aggressive tactics have provoked criticism from other groups, making them the black sheep of the conservation movement.