Many historians believe that it was partially an influx of rats that led to the deforestation of Rapa Nui, the island often known as Easter Island. Transported by early Polynesian voyagers, the rats quickly multiplied on the small island.
In 1932, farmers in Western Australia had a problem. An estimated 20,000 Emus were overrunning their wheat fields. The large flightless birds -often taller than 6ft/1.8meters- were a big nuisance for the farming community and so they asked the military to step in and kill them.