Habitat loss and poaching are the two biggest threats the critically endangered Sumatran tiger faces. The expansion of oil palm plantations was the primary driver behind a nearly 20 percent loss in Sumatran tiger habitat between 2000 and 2012, one study found. (Palm oil, from the oil palm tree, is now the world’s most popular vegetable oil, used in everything from cookies and pizza dough to lipstick and soap.) Loss of prey animals because of deforestation is also having a negative effect on Sumatran tigers.