Learning to the Rescue Australia’s northern quoll (left) is threatened by the introduction of an invasive species known as the cane toad (right). The quolls eat the toads, which carry a lethal dose of poison, but they can learn to avoid this toxic prey through conditioned taste aversion (O’Donnell et al., 2010).

left: Eric and David Hosking/CORBIS; right: Chris Mattison/FLPA/Science Source