Babies in Bolivia are being born sick, some with missing fingers and deformed ears. Parents fear that mercury could be poisoning their children. Illegal gold miners are dumping tonnes of toxic mercury into the Madre de Dios River. It builds up in the food chain, contaminating a mighty river that pours into the Amazon rainforest -- poisoning the water, the wildlife, and the main food source for entire communities. And in pregnant mothers, mercury crosses into the growing baby. Now river communities are fighting back and they're calling for help. They're collecting hair and water samples to build a rock-solid case that would ban mercury dumping in the river -- and set a precedent for river communities across the Amazon. Avaaz helped fund the first tests, but 36 communities still need testing before heavy rains come in November, and remote villages are cut off. The more testing they do, the stronger their case. And not just for their children: if they win in court, the river itself could be given legal rights, with rehabilitation and permanent monitoring of water quality. This is a special appeal to fund the first large-scale mercury testing run by community groups in Bolivia. Your donation will provide testing kits and emergency care for dozens of river communities. We'll pay for specialist labs to detect hidden toxins, building an undeniable body of evidence to save this river of life. If we raise enough, we'll also fund other communities fighting to protect our planet's most precious rivers. And when the evidence is powerful, Avaaz will launch huge public campaigns, forcing governments to act. Every day without testing is another day of poison in Bolivia. Please donate what you can to help families protect the river and their children: