Researchers from the Evolutionary Biology Centre, Uppsala, Sweden and the Donana Biological Station, Seville, Spain studied 82 species of birds from 22 families.

瑞典乌普萨拉进化生物学中心及西班牙塞维利亚多纳纳生物站的研究人员对22个科的82个种的鸟进行了研究。

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Dr Carles Vila, from the Conservation and Evolutionary Genetics Group at the Donana Biological Station in Seville, Spain, said the debate was wide open.

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Quaint summerhouses dating back to the 1920s bring visitors to Rodd Island, a former biological research station nestled in Iron Cove near the Sydney suburb of Rozelle.

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"There are no radioactive, biological, chemical and other dangerous materials on board the station, " the foreign ministry said.

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