They are cared for by foster mother Oshine, an orangutan from Borneo rescued from the illegal pet trade in South Africa in 2010.
Monkey World director Dr Alison Cronin said: “It is so important that the babies grow up with others of their own kind rather than with people so that they mature into healthy and well-adjusted adults.
“It is hard work caring for two needy orphans but it means the kids will be able to grow up together under the watchful eyes of their older brothers and sisters and adopted mother.
“It is quite an international crowd at the orangutan nursery and, while it is very sad that they are not being cared for by their mothers, all of us from Spain to Ireland to Dorset are doing everything possible to give these gorgeous babies families of their own kind.”
With the addition of Kiwi and Sibu, Monkey World said it has cared for 13 orphans from seven countries over the years.