Europeans ate their way through the island nation of Mauritius, most famously eliminating the dodo bird by 1700. Less well known was their effect on the Mauritian island now known as Ile aux Aigrettes, where they exterminated giant skinks and tortoises and logged the native ebony trees for firewood. In 1965 the largely denuded 25 hectares of the island were declared a nature reserve. But even in the absence of logging, the slow-growing ebony forests failed to thrive. Why? Because they had lost the animals that ate their fruit and dispersed their seeds. So in 2000 scientists relocated four giant tortoises from the nearby Aldabra atoll in the Seychelles, and by 2009 a total of 19 such introduced tortoises roamed the island, eating the large fruits and leaving behind more than 500 dense patches of seedlings....For this tiny island, at least, rewilding appears to have worked. And that holds out hope for other restoration ecology projects in the midst of the sixth mass extinction in the earth’s history. – Scientific American, July 2011, p. 16
"Greene and a number of other highly eminent ecologists and conservationists have authored a paper, published in the latest issue of Nature (Vol. 436, No. 7053), advocating the establishment of vast ecological history parks with large mammals, mostly from Africa, that are close relatives or counterparts to extinct Pleistocene-period animals that once roamed the Great Plains. The plan, which is called Pleistocene rewilding and is intended to be a proactive approach to conservation, would help revitalize ecosystems that have been compromised by the extinction of many of the continent's large mammals, many of them predators." - Krishna Ramanujan, Cornell conservationists propose allowing wild animals to roam parts of North America, cornell.edu, 17 August 2005.