David Sheldrick was fully devoted to the welfare of African wildlife, which he deemed sacrosanct. For over two decades, with Daphne's assistance, David more or less single-handedly built Tsavo East National Park, Kenya's largest national park. This sanctuary became the protected home to the country's biggest elephant population. In 1977, Dame Daphne Sheldrick's husband, David, passed away. Her husband had dedicated his life to wildlife protection and the park. In her husband's memory, Dame Daphne Sheldrick founded the David Sheldrick Wildlife Trust. The conservation organization has become one of Africa's oldest wildlife charities. Dame Daphne went on to spend over six decades of her life protecting wildlife in Africa as a conservationist.