The documentary "Cane Toads: An Unnatural History" discusses the failed attempt in the 1930s to control pests damaging sugar cane crops in Australia by importing cane toads from Hawaii. The cane toads were ineffective against the sugar cane grubs and instead overpopulated, laying thousands of toxic eggs each that poison many native predators. The documentary prompts viewers to answer questions about the problems faced by sugar cane farmers, the origin and breeding of the invasive cane toads, their toxic effects on local wildlife, and the strange behavior of one individual.