The zoo said it enriched both species’ environments.

And as these extraordinary pictures show the orangutan family are besotted with their unusual pals.

Mum Sari and baby Berani can often be found playing a game of hide and seek with the otters.

While dad, Ujian, loves to grab the attention of the cute crowd and entertain them as a large group.

A spokesman at the zoo said: “Two factors are very important for the well being of an animal in captivity: the size of his enclosure, but also the quality of his enclosure.

“This means that an animal – and this is even more the case of orangutans, with whom humans share 97 per cent of their DNA – must be entertained, occupied, challenged and kept busy mentally, emotionally and physically at all times.
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