Wild crocodiles in Australia keep dying from eating toxic cane toads, so scientists have trained them to avoid the deadly meal by giving them a memorable dose of food poisoning.They set nearly 2400 baits – removing the toxin from toad carcasses and infusing them with lithium chloride, which is known to induce nonfatal nausea in reptiles. Initially, nearly all the baited toads and unbaited chicken necks were eaten, but within five days, as the food poisoning symptoms spread through the four local crocodile populations, the predators began to wise up and stopped eating the toads, while continuing to eat the chicken.

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