In 1999, Terry Pratchett visited Prague Zoo. He got to know our giant tortoises and then he gave a lecture. A member of his Czech fan club Martin T. Schwarz recalled years later: “As expected, Terry Pratchett started to talk about his work for the Orangutan Foundation. (…) A particularly vivid story about Master’s meeting face to face an orangutan male in the wild, who reportedly looked like a huge cube and three Schwarzeneggers next to each other, made a big impression on all of us.”

Terry Pratchett created in his work the character of the Librarian – an orangutan, who was communicating by the word “Oook” or “Ook” and hated people, who referred to him as a “monkey” instead of correctly as an Ape or Librarian. In the real world then this Librarian was helping Terry Pratchett to fundraise for orangutans living on Sumatra and particularly on Borneo. For the last time, Terry Pratchett went to see them even after he had developed Alzheimer disease and recorded for BBC a documentary dedicated to their protection.

On first sight the name Terry looked like an obvious choice. But this was a wrong move: it sounds very similar to Diri and the name could confuse the orangutan siblings.

So, we had to keep looking. We already knew what we wanted from the proposals: a name, which would refer if not directly to Terry Pratchett, then to his Librarian. In the end two names got stuck in our sieve: Kusasi and Pustakawan. Kusasi was the orangutan male, whom Terry Pratchett looked for in the Borneo forests in the above-mentioned documentary, and Pustakawan means Librarian in Indonesian. Which name did we decide for in the end? Our keepers were voting – and Pustakawan won. So, our orangutan male is called Pustakawan, or Kawi for short.