Changes in Predator Predictable Faced with Toxic Toad
AwN | When people released Cane Toads, they were primarily interested in themselves, and they were wrong entirely about any purpose there might have been. Eventually they realized that the toads weren't eating the beetles they wanted (the beetles were feet in the air and the toads, well, on the ground) and all of the continental Australian island predators were eating the toxic toads. Giant decreases in Australian toad predators were measured.
So scientists began studying Australia's predators and comparing them with the population of (READ cardiac glycoside resistant) cane toad populations from other continents. They now believe that the evolution of Australia's predators (snakes, goanas etc) will follow a very particular and predictable path, eventually leading to nearly complete resistance amongst their populations.