The rhino population across the world has increased slightly but so have the killings, mostly in South Africa, as poaching fed by huge demand for rhino horns remains a top threat, conservationists said in a new report. The rhino population across the world has increased slightly but so have the killings, mostly in South Africa, as poaching fed by huge demand for rhino horns remains a top threat, conservationists said in a new report. Plants & Animals Ecology Phys.org – latest science and technology news stories