That is happening in a sense -- for quolls. See the linked story in the article. Scientists make sausages out of toad meat and add a nauseating agent. Quolls

That is happening in a sense -- for quolls. See the linked story in the article. Scientists make sausages out of toad meat and add a nauseating agent. Quolls are learning to avoid toads. Might take a few generations.