An orangutan at Perth Zoo has been named the world's oldest Sumatran orangutan in captivity by the Guinness Book of World Records, as she celebrated her 60th birthday on Thursday.<br />Puan was gifted to the zoo in 1968 by the Sultan of Johor who received some native Australian animals in return.<br />Zookeepers said she is in good condition with an amazing coat, although she does suffer from a touch of arthritis
