Congress is voting on whether to cancel a decision made by the U.S. Fish and Wildlife Service (the federal agency that decides which animals and plants need special protection to avoid extinction). That agency had recently declared a small fish called the longfin smelt, found in the San Francisco Bay area, to be an endangered species, which would trigger legal protections limiting activities like water withdrawals, construction, or development that could harm the fish or its habitat. If this resolution passes, that endangered listing gets wiped out, meaning the fish would lose those protections and businesses, farmers, and water agencies in the area would no longer have to follow the extra rules meant to safeguard it.