According to Yale University, “in humans, chronic exposure to high selenium concentrations can cause nausea, fatigue, skin lesions, and neurological disorders. In other animals, high levels of the element have been shown to cause liver damage, paralysis, and even death. In the waterways it leeches into, it bioaccumulates in fish and plants, meaning the concentration keeps becoming more toxic to its host. It will kill the fish and deplete the resources altogether. Larger animals like cattle have become infected and gotten sick so it’s very important to monitor any water supply where animals or birds will have access to.