In the 1990s, major conservation groups like the World Wildlife Fund started to rethink that approach. If they focused on saving entire habitats and regions, they could save all the animals that lived inside. One lovable animal might stand in for an entire ecosystem—the jaguar, for example, could serve as a spokesmodel for the Amazon rainforest where it lived. When the WWF raises money for its Southeast Rivers and Streams Ecoregion, it can use beautiful nature scenes like the one shown here. But the streams are important because they provide a home for one of the most endangered animals in the United States: the freshwater mussel. The WWF isn't likely to raise a cent with posters of these homely mollusks.