Fish who eat toadpoles die. Animals who eat young toads and adults die. The museums have plenty of snakes preserved in jars which were killed by toad toxin so fast, the toad is still in their mouths unswallowed. Even small amounts of water which toadpoles have gotten into, such as a pet's water dish, can be poisoned by toadpoles. When the pet comes along to drink from it's dish, it becomes sick.
Local vets report that a couple dogs a month are brought in ill just from mouthing toads.
Captive cane toads will eat everything from dog food to mice and they keep growing until they reach 25cm in length and over 2 kilos. A theory is that when toads first colonise a new territory, there is abundant food supply. The toads gorge themselves and get quite large. Cane toads have proven themselves to be one of Australia's worst environmental disasters. Since 1935, they have spread across most of Queensland, they are over the border into the Northern Territory and they have now reached the world-reknowned wetlands of Kakadu.