clipped from: news.bbc.co.uk   
An orangutan used a branch to short-circuit a security fence and escape from an Australian zoo, only to change her mind and return to her enclosure.
Karta the orangutan
Karta, a 27-year-old primate, cleared one fence and began piling up debris to scale a wall at Adelaide Zoo.

It was not the first time Karta had caused a headache for the zookeepers.

"You're talking about an animal that's highly intelligent," Mr Whitehead said.

"We've had issues with her before in normal day-to-day operations where she tries to outsmart the keepers. She's an ingenious animal."