As human and industrial waste from nearby cities increasingly contaminate the famed lake that straddles the border between Bolivian and Peru, the native Aymara people who rely on it for food and income say action must be taken before their livelihoods, like the frogs, die off.

"We used to live off of fishing," said Juan Quispe, a local villager. "But now we have nothing to sustain us." The fish have moved farther and farther from shore.

On a recent Saturday, the 78-year-old Quispe joined a cleanup brigade to remove dead dogs, tires and other refuse from the shore of Cohana Bay where the lake meets the Katari River.