Tallinn Zoo exhibits the black rhino subspecies Diceros bicornis michaeli.In the early 20th century the black rhinoceros was the most numerous of the world’s rhino species. Relentless hunting and clearances of land for agriculture reduced the black rhino population and by 1960 only an estimated 100,000 animals remained. Between 1960 and 1995, large-scale poaching caused a dramatic 98% collapse in numbers which bottomed out at only 2,410 in 1995.From then on, the rhino population gradually recovered and by the end of 2010 reached 4,880 individuals.The number of black rhinos has grown mainly thanks to successful conservation efforts in four countries: South Africa, Namibia, Zimbabwe and Kenya. Almost 98% of the total population is found in just these countries.