An environmental group is hoping to get people interested and informed when they hear the sounds of threatened animals, from a passerby's cellphone. Already, some 24,000 people have downloaded the free rare ringtones from the center's Web site. "The point here is education and inspiration," said Michael Robinson, a conservation advocate at the Center for Biological Diversity's office in Pinos Altos, N.M. While the ringtones might be amusing to hear, Robinson said the ringtone idea is serious business: "We can get people thinking about something outside their immediate world, a more wilder world." Four in five voting-age Americans have cells phones, and that number is expected to keep growing. Peter Galvin, a co-founder of the Center for Biological Diversity, came up with the idea for the free ringtones of endangered and rare species as a way to educate people - especially the younger, technologically savvy generation. "And with young people, it has to be interesting and it has to be cool," he said.