Helicopter-borne marksmen killed more than 5,000-camels in a five-day cull of feral herds that were threatening indigenous communities in drought-stricken areas of southern Australia, officials said. Aboriginal leaders in South Australia state said extremely large-herds of the non-native camels had been driven towards rural-communities by drought and extreme heat, threatening scarce food and drinking water, damaging infrastructure, and creating a dangerous hazard for drivers.