If you're one of those people who likes custom ringtones for your cell you might want to try something new. Go to www.biologicaldiversity.org . They have free ringtones of endangered and rare species. They've got 40 ringtones to choose from and they run the gamut from owls and macaws to wolves, toads and beluga whales. Imagine what your friends will think when they hear a toad croaking in your pocket. And they are free.