Dead White Rhinoceros (Ceratotherium simum) killed by poachers for horn, central Kenya. Photographer learned later he may have been in the gunsights of poachers when making this picture. Across the African continent rhinos, both black and white, are heavily poached for their horns making them one of the most endangered species. Currently, Black rhino population in Africa is estimated to be less than 3600. In 1900 it was estimated to be in the hundreds of thousands.