This 2-foot-long, black-masked member of the weasel family once occurred in central grasslands and basins from southern Canada to Texas but is now one of the most endangered mammals in North America.

The Center for Biological Diversity today filed a motion to intervene in a lawsuit brought by Texas that seeks to strip Endangered Species Act protections from seven imperiled freshwater mussels.

Leading wildlife experts and wolf biologists today urged the University of California, Davis, to take corrective action after the school published a misleading article about wolves.