The natives killed our cattle to survive, I think so anyway, then we killed around 190,000 of them, which makes us fell horrible, if you don't believe me, just search up 250,000 - 60,000.
As you probably know, 25 - 6 = 19, so that means 250,000 aborigines - 190,000 of them, = that leaves only 60,000 of the native Aussies left.