Feral cat eats a small Australian native mammal and is poisoned by a PPI

The Aussies have created another novel way of killing feral cats. They spend many thousands of hours dreaming up new ways and this is the latest. They inject into a native small mammal such as a bilby, a rice-sized implant. They call them population protecting implants or PPIs. They are placed under the skin of the animal. These small mammals are dinner-sized creatures for the feral cats of the Australian continent. Note: this is me reporting and commenting on the news. Journos call them op-eds. Bilby - Credit: UniSA. When inside the prey animal nothing happens. The pellet is covered by a protective coating. It contains a toxin derived from a natural poison in native plants. PPIs are harmless to tolerant native mammals they say. However, once the mammal is eaten by a feral cat they become a deadly toxin as the implant is activated in the predator's stomach. They don't tell me how that transformation from a passive object under the skin becomes a deadly poison in a cat's