Australia's cane toads evolved as cannibals with frightening speed.

@article{Kozlov2021AustraliasCT,
  title={Australia's cane toads evolved as cannibals with frightening speed.},
  author={Max Kozlov},
  journal={Nature},
  year={2021}
}

References

The evolution of targeted cannibalism and cannibal-induced defenses in invasive populations of cane toads

C cane toad tadpoles from invasive Australian populations have evolved an increased propensity to cannibalize younger conspecifics as well as a unique adaptation to cannibalism—a strong attraction to vulnerable hatchlings—that is absent in the native range.