There are only 5000 Tigers alive in the wild. If people in Australia really care about Bio Diversity so much and really want to decrease the populations of feral camels, horses, deer, pigs, goats and buffalo then they should introduce the tiger here. The reason these ungulates are able to live in such numbers is because they have no predators in Australia, Tigers will not affect the local ecology either, they are all too small for a tiger to bother with.