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WikiPedia: Bò_Heck http://www.markjjones.dsl.pipex.com/oosvaadersplas... http://www.timesonline.co.uk/tol/news/uk/science/a... https://www.theguardian.com/world/2015/jan/05/devo... https://web.archive.org/web/20081122123746/http://... https://web.archive.org/web/20150108055814/http://... https://www.independent.co.uk/environment/nature/h...