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Man's taste for the eggs of the Genyornis are blamed for it's extinction. We hear from one of the researchers, Gifford Miller, from the University of Colorado in the US. <Picture: A giant flightless bird known as Genyornis newtoni (R) is surprised on her nest by a 1 ton, predatory lizard named Megalania prisca in Australia roughly 50,000 thousand years ago. Credit: Reuters>