The following list of animals is the most concern to Australia's native flora and fauna.
- Cane toad (Bufo marinus)
- European wild rabbit (Oryctolagus cuniculus)
- European red fox (Vulpes vulpes)
- Feral camel (Camelus dromedarius)
- Feral cat (Felis catus)
- Feral goat (Capra hircus)
- Feral horse (Equus caballus) and Feral donkey (Equus asinus)
- Feral pig (Sus scrofa)
- Feral water buffalo (Bubalus bubalis)
All domesticated pets, with the exception of some native birds such as finches, and various parrots such as budgies, cockatoos, cockatiels, Bourkes, etc, have been introduced into Australia. Non-native birds include Indian mynas, common starling, mallard and rock pigeon.
Wild dogs are now a major issue, and a danger to both man and Australia's native animals. They also breed with dingoes, resulting in increasing threats to the population of pure-bred dingoes (which are, in themselves, essentially non-native, having come over from Asia with the first Aborigines).
All livestock has been introduced, and where sheep and cattle are bred on huge stations out west, this has also had a significant environmental impact, destroying the habitat of native animals. Deer are also introduced animals, as are water buffalo.
Rats and mice are completely introduced, as are hares. Insects include the honey bee and the fire ant.
Of particular concern to Australian waterways are European carp.