It is South Africa's largest private game reserve, covering an area of over 111,000 hectares.
He bought dozens of farms to create a conservation reserve, introducing African wildlife back into their natural habitat, including lions, rare types of antelope, giraffes, buffalos, black rhinos and zebras.
To control the numbers and create a form of revenue to support the estate, there was a controversial hunting site called Tarkuni.
Tswalu now holds black rhino alongside other threatened species like the pangolin and canid African wild dog.
[5] The conservation work of Nicky and Strilli Oppenheimer was recognized with the WWF-Lonmin Award from the World Wide Fund for Nature in 2007.