Staff at Basel zoo are carrying out a paternity test after the birth of an orangutan with any one of three potential fathers.
Ombak was born last month to 17-year-old Kila, a Sumatran orangutan that came to the zoo with five other members of her species in 2012.
The identity of the father is unknown as Kila shares the enclosure with three males.
Zoo vet Fabia Wyss described Kila as a real “go-getter” and very popular with the males.
A test will now solve the mystery around which of them is the father.
Ombak’s birth comes four years after that of Ketawa, which made history as the first orangutan to be born at the zoo since 1900.
It is the first baby for Kila, which has some experience of maternal care, having “adopted” a two-year-old sister eight years ago following the death of their mother.
Ombak will be dependent on its mother for up to seven years and learn everything it needs to know, as orangutans become solitary animals.
Sumatran orangutans are one of the most endangered animal species in the world, comprising only nine existing populations left in the wild, with just three populations numbering 1,000 or more.
Known as “gardeners of the forest”, they have a major role in rain forest seed dispersal and in maintaining the health of the forest ecosystem, a function that is vital for a range of other animals, including tigers, Asian elephants and Sumatran rhinos.
Despite the development of protected areas, more than 50 per cent of orangutans are found in forests under management by timber, palm oil and mining companies.