- Rabbits: European rabbits were introduced to Australia in the 1800s for hunting purposes. Since then, they have spread rapidly and become a significant pest, causing extensive damage to native ecosystems and competing with native species for food and habitat.
- Red Fox: Red foxes were introduced to Australia by European settlers in the 19th century for hunting and fur trade. They have become a major predator of native Australian animals, particularly smaller mammals and ground-nesting birds. Red foxes have had a devastating impact on many native species and have contributed to population declines and even extinctions.
- Cane Toads: Cane toads are native to Central and South America and were introduced to Australia in the 1930s as a biological control agent to manage the cane beetle population in sugarcane plantations. However, cane toads have had unintended consequences, including their rapid spread and colonization of various ecosystems. Cane toads pose threats to native species through competition, predation, and their toxic skin secretions, which can be harmful or fatal to many predators and native animals.