Big herbivores!

[Suhail]

Giant, feral herbivores of Australia. 

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While the population of the mega herbivores on decline in numbers and struggling to survive its native range, Australia extraordinarily wild and filled with wild camels, wild cattle, wild donkeys and deer and water buffalo and all sorts of creatures.introduced as pack animals in 19nth century for human needs, these Beasts escaped to wilderness and made its own feral population which are thriving across the continent especially on the rich tropical northern region. 
Australia is not the only country with invasive creatures. But given that it is an isolated continent, most of its wildlife is endemic, and its top predators are long extinct. This affords alien species a greater opportunity to thrive in uncontrollable numbers.. Most of the new populations are feral, that is, they’re wild now but are descended from domesticated versions of extinct species. 
Eradication.. 
Wildlife officials have attempted to fight these invaders by releasing viruses, spreading poisons, building thousands of miles of fences and sometimes hunting them from helicopters which are too costlier and time consuming. 
Damages caused by feral buffaloes, camels, horses... 
Buffalo are a big issue for those managing land. causing extensive damage to natural waterholes, destroying wetlands and spreading weeds.The natural increase of the feral population has beenestimated at around 27,000 head per year, exceeding the amount of buffalo harvested by musterers or culled by rangers. 

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Australia has some 300,000 feral camels, 
camels are cause for their misery as they aggressively compete with them and their cattle over the region's limited water resources.Damage to vegetation and increased risks to biodiversity by competing with native animals, disturb game species or get in the way of hunters.They cause yearly damage worth $10 million.. 
Positive impacts from feral animals.. 
As large herbivores, these introduced species can consume plant matter indigestible to smaller herbivores, which may reduce fire frequency, accelerate nutrient cycling, and shape plant communities,  By grazing tree seedlings, large herbivores keep grasslands from turning into forest and reduce fire risk. By grazing in one place and pooping in another, they move nutrients around.Eric Beever, a United States Geological Survey ecologist based in Bozeman, Montana, says that while some grazing on a landscape might be great, too much can reduce the diversity of other flora and fauna, from small mammals to plants. 
Australia's camels are the last wild herds in the world!! 
If we were to eradicate wild camels and wild buffaloes from Australia, the world of the last wild herds of these creatures goes extinct.
Rewilding Australia to replace extinct animals. 
Australia used to have all sorts of native megafauna, which included animals like giant kangaroos and wallabies, wombat-like creatures called Diprotodon that may have weighed up to three tonnes, giant lizards known as Megalania and many others. 
Diprotodon:

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Australia has been empty of [herbiviorous] megafauna for tens of thousands of years since the extinction which have resulted a great loss in the country's ecology that introduced megafauna might be helping to fill.by mimicing lost functional roles once played by extinct megafauna are probably being partly replaced by introduced megafauna.
Bringing lions, tigers, Komodo dragons to northern Australia?
Marsupial lion:

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In the past other people have considered re-introducing animals such as lions, tigers or Komodo dragons to Australia, to replace extinct animals such as marsupial lions( thylacoleoor) Megalania, a giant lizard that once roamed northern Australia.
Scientists recently reintroduced tasmanian devils, a ferocious predator that would prey on smaller invasive mammals 
Some of the introduced animals of Australia :

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