Bornean

The Bornean orangutan which arrived on 28 April has been named Rufus.

Previous sex chromosome sequences for these species were incomplete or -- for the Bornean orangutan and siamang -- did not exist.

Bornean orangutans rubbed themselves with juices from a medicinal plant, possibly to reduce body pains or chase away parasites.

Sumatran orangutans live in habitats with high food supply while Bornean populations live with low and fluctuating food availability.

The oldest known figurative painting—thought to depict a wild cowlike animal—was found in a Bornean cave and dated to at least 40,000 years ago.