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Why was Marius, a healthy 18-month-old giraffe, killed on Sunday at the Copenhagen Zoo? Employees say it’s because Marius had genes too similar to other giraffes and was killed to avoid inbreeding. But the act has caused an uproar on social media and among animal activists. Robert Siegel talks to Bengt Holst, the scientific director at the Copenhagen Zoo, about the decision to put the giraffe down.