Growing problem / The first 24 camels were imported in 1860 for the Burke and Wills expedition. / By 2008, it was feared that this population numbered about one million, and was doubling every 8–10 years. They were degrading the environment and threatening native species, so a culling program was introduced and by 2013 the feral population was estimated to have been reduced to around 300,000.
Endangered Species: Bridled Nail-tailed Wallaby of Australia was thought to be extinct until 1973 when a small population was found. Conservation efforts were put into place, but the species is still endangered. There are only about 500 in the world.