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Onion (19th September 2000 - 17th May 2011, aged 10) was a male siamang gibbon.

He was born at Monkey World to Sam and Sage as part of a European breeding programme. Due to birth complications, Onion had to be born via c-section.

In order to avoid conflicts and that there was no space in zoos for siamang gibbons, Onion and Sam were neutered.

In 2009, Onion lost his mother Sage.

Onion sadly passed away on 17th May 2011.