In 1978 twins Bono and Suma were born to Olga at the Melbourne Zoo. At the time, they were one of only five sets of orang-utan twins born in captivity across the world.
Bono and Suma's mother Olga became very ill soon after their birth and the twins were hand raised by a team of zoo staff, headed by keeper Uli Weiher. Another orang-utan, Girlie, became a foster mother to the two young primates after the death of their mother.
The orang-utan twins became media darlings, with the press and public being fascinated with the work that went on behind the scenes at the zoo.
150 years Melbourne Zoo, Zoos Victoria, Bounce Books, 2012
Bono and Suma, Melbourne Zoo orang-utan twins, 1978
Public Record Office Victoria
VPRS 8850/P1 unit 48
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State of Victoria