The number of rhinos killed for their horns in South Africa has decreased during the first six months of the year, as authorities intensify efforts to combat illegal poaching of endangered species. The South African Department of Environment announced that from January 1 to June 30, 231 rhinos were killed for their horns, which is 28 less than during the same period last year. The department added that joint efforts involving law enforcement, customs officials, and private security have led to the conviction of poachers. However, the continued demand for rhino horns means that the threat to rhino populations persists. Rhino horns are primarily composed of keratin, a protein also found in human hair and nails.