Conservationists and animal are mourning the of Sudan the rhinoceros. Sudan was the world's male northern white rhino. Sudan, 45, was put down at a zoo in Kenya after "-related complications". He had been in health due to his old age. Officials say his "worsened significantly" and he was not enough to stand. His had deteriorated and his skin had "extensive wounds". The zoo's said: "Sudan's death was a cruel symbol of human disregard for and it saddened everyone who knew him."
Hunters have hunted the northern white rhino to -extinction. There were more than 2,000 in the in the 1960s but their numbers fell because of the of their horns. The only northern white rhinos alive today are Sudan's daughter and granddaughter. They live in so they will be protected. There are hopes they can produce to keep their going. In vitro fertilization using semen from other dead rhinos could be used with Sudan's . The zoo wants to raise $9 million to fund the project.