Around the world, a majority of examined birds of prey carry measurable rodenticide residues, and in at least one U.S. study every tested red-tailed hawk showed exposure to these chemicals. When a predator such as an owl eats a rodent that has ingested poison, the toxin transfers into the predator and can be fatal. This process is known as secondary poisoning. Second-generation anticoagulant rodenticides like brodifacoum persist in tissues for many weeks and remain toxic long after the original