Earlier this year, a driver accidentally struck and killed Grizzly 399, the world's most famous grizzly bear. The bear had captivated tourists, photographers, and scientists for years and, at 28, was famous for being the oldest known mother bear in Yellowstone. But the Endangered Species Act protections that allowed her to live for so long are now in danger of being removed. That's why the Center for Biological Diversity started a petition to ensure these safeguards remain. To read or sign the c