The International Union for the Conservation of Nature (IUCN) rates the bullfrog as "Least Concern". This is because they are found almost in every continent. "Least Concern" means that the bullfrog is not an endangered species. There are more bullfrogs in southern United States than there is in the north. However, bullfrogs populations are decreasing because of habitat loss, water pollution, pesticide and over harvesting. In 2012, Mark W. Stone chairman of the Santa Cruz County Board of Supervisors, is currently trying to ban the import, sale, and the keeping of bullfrogs in Santa Cruz, California. If the board signs the bill, Santa Cruz will be the first county in the United States to ban bullfrogs. Stone is trying ban bullfrogs because of the bullfrogs appetite. They have been blamed for making many animals become an endangered species in that state.