Thousands of poisonous cane toads met their fate on Sunday as gleeful Australians gathered for a celebratory mass killing of the hated amphibians, with many of the creatures’ corpses being turned into fertilizer for the very farmers they’ve plagued for years.

Hundreds of participants in five communities across northern Queensland snacked on sausages, sipped cold drinks and picked up prizes as the portly pests were weighed, measured and killed in the state’s inaugural “Toad Day Out” celebration. The toads — which can grow up to 8 inches in length — were imported from South America to Queensland in 1935 in a failed attempt to control beetles on sugarcane plantations. Trouble was, the toads couldn’t jump high enough to eat the beetles, which live on top of cane stalks.

The toads bred rapidly, and their millions-strong population now threatens many local species across Australia. They spread diseases, such as salmonella, and produce highly toxic venom from glands in their skin that can kill would-be predators. The toads are also voracious eaters, chomping up insects, frogs, small reptiles and mammals.

Queensland politician Shane Knuth, who came up with the Toad Day Out idea, said each adult female cane toad capable of producing 20,000 eggs. Killing even a few thousand toads could wipe out millions, he added.