A bushranger was an outlaw from Australia's colonial and goldrush times. They used the cover of the Australian bush, which was dense and therefore easy for them to hide in, to ambush travellers or people living in outlying settlements.
In the beginning, the first bushrangers were escaped convicts, but many of these did not survive the conditions of the bush, often surrendering to the authorities after a short while.
Later, bushrangers came more from workers on the land, who saw bushranging as an easy option for making money. Some were descendants of convicts who still had the fire of rebellion in their blood. Ned Kelly, Australia's most notorious bushranger, came from this group.
Once the goldrushes were on, there were plenty of pickings among the coaches that carried the gold and currency between the major centres.