One of the biggest threats to natural habitats and healthy ecosystems around the world is the introduction of non-native invasive species into their realm. It could be a form of plant life like Purple Loosestrife or Kuduz or an animal or insect like the European Starling or the brown marmorated stink bug. But the result is usually the same with the invader proliferating and eventually wiping out all of the other competing species thus creating an ecological disaster. Certainly one of the strangest documentaries to concentrate on an encroaching menace is Cane Toads: An Unnatural History (1988). Directed by Mark Lewis, the film charts the introduction of the voracious and fast-breeding amphibian to Northern Queensland in Australia and its devastating effect on the continent.