The zoo says it cannot keep Marius the Giraffe because of European rules to avoid in-breeding. Also, attempts to find the 18-month-old giraffe a new home have failed. The Copenhagen Zoo said it needs to kill the giraffe before he becomes an adult and attempts to mate. Animal rights campaigners in Denmark are trying to save the young giraffe, saying it would be barbaric to kill it. The zoo insists the giraffe population must be kept "genetically sound."