Cane Toad (Rhinella marina): Native to South and Central America, the cane toad was introduced to Australia, the Pacific, and Caribbean islands to control agricultural pests. Instead, it became a devastating invader. It reproduces rapidly, laying up to 30,000 eggs at a time, and secretes a potent toxin from glands behind its ears, lethal to native predators like snakes, quolls, and crocodiles. With no natural enemies in its introduced range, it spreads across landscapes, outcompeting native amphibians for food and habitat. In Australia, it has advanced over 1,500 miles, causing population declines in numerous species. Control methods include barriers and public eradication campaigns, but complete removal is nearly impossible. The cane toad exemplifies the dangers of poorly planned biological control and ecological ignorance.
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