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Christie's specialist James Hyslop holds a pre-17th century, sub-fossilized Elephant Bird egg in London. The rare egg is expected to sell for 20,000-30,000 GB pounds (U.S. $30,000-45,000) when it is auctioned in London on April 24. The extinct Elephant Bird, a native of Madagascar, was a large bird measuring around 11 feet in height.