The Troublesome Toad

Source: Food and Agriculture Organization of the United Nations, 2013, Kieran Noonan-Mooney, CBD and Christine Gibb, CBD and FAO, "The Youth Guide to Biodiversity" 1st Edition (Chapter 2) Youth and United Nations Global Alliance. Reproduced with permission.

Chapter 2. Saadia Iqbal, Youthink! Verbatim.

It all started with some beetles that were destroying sugarcane crops in Australia. A type of toad called the cane toad was brought in from Hawaii, with the hope that they would eat the beetles and solve the problem. Well, the toads left the beetles alone, but ate practically everything else, becoming full-fledged pests in their own right.  

Now they are running amok, preying on small animals and poisoning larger ones that dare to try eating them. Scientists are still trying to figure out what to do.

Source: australianmuseum.net.au/Cane-Toad