common minke whale may be sustainable: This raised concerns among some environmental groups such as Greenpeace, fearing it could add fuel to the Japanese wish of continuing its annual cull. In contrast to his stance on the minke whale quota, Flannery has expressed relief over the dumping of the quota of the rarer humpback whale, and further was worried how whales were slaughtered, wishing them to be "killed as humanely as possible". Flannery suggested that krill and other small crustaceans, the primary food source for many large whales and an essential part of the marine food chain, were of greater concern than the Japanese whaling. Species introduction In The Future Eaters, Flannery was critical of the European settlers introducing non-native wild animals into Australia's ecosystem. At the same time, he suggested that if one wanted to reproduce, in some parts of Australia, the ecosystems that existed there around 60,000 years ago (before the arrival of the humans on the continent), it may be necessary to introduce into Australia, in a thoughtful and careful way, some non-native species that would be the closest substitutes to the continent's lost megafauna. In particular, he proposed the Komodo dragon be brought into Australia as a replacement for its extinct relative, Megalania, "the largest goanna of all time". He also suggested the Tasmanian devil could be allowed to re-settle the mainland Australia from its Tasmanian refuge area. In The Eternal Frontier, Flannery made a proposal for what later became nicknamed "Pleistocene rewilding": restoring the ecosystems that existed in North America before the arrival of the Clovis people and the concomitant disappearance of the North American Pleistocene megafauna 13,000 years ago. He proposed if, in addition to the wolves that have been already re-introduced to Yellowstone National Park, ambush predators, such as jaguars and lions should be reintroduced as well, in order to bring the number of elk under control. Furthermore, the closest extant relatives of the species that became extinct around the Clovis period could be introduced to North America's nature reserves as well. In particular, the Indian and African elephants could substitute, respectively, for the mammoth and the mastodon; the Chacoan peccary, for its extinct cousin the flat-headed peccary (Platygonus compressus). Llamas and panthers, which still survive outside of the US, should too be brought back to that country. Human population Flannery advocated for human population planning in Australia in the 1990s. He has