Chimpanzees used a branch to escape from their enclosure at the Belfast zoo in the second breaking of the animals over the past week.
They exploit the damage caused by storm time to start a breakout surprised by visitors caught in the movie.  It came after a red panda boy called Amber was found in a garden less than a mile from the zoo after fleeing from the enclosure last month.
The latest bid for freedom was made by chimps that used the branch as a makeshift ladder and scaled high walls surrounding their pen on Saturday.
Visitors described one of the survivors who came out of the shrubs to a path while others were sitting over their enclosure wall
In a footage posted on social media, a kid heard that saying: "Do not escape the bad little gorilla."
Zookeeper Alyn Cairns said that the trees in their enclosure were weakened by storms, abolishing them and using them as a ladder to escape.
He told the BBC: "They are smart primates and know that they should not be out of their enclosure, so they can get back to themselves."
Danielle Monaghan, who was in the zoo with her two children, partners and young women, expressed concern for safety.
"I have a petrified, obviously, having children and I try not to show fear but I'm in a bit what will happen if it attacks us or tries to bring children or run, "he told the BBC.
"But we just have to stay calm, it's probably a different story if it's aggressive but it's not really. We're feeling at ease. We just walk through it and it's is quite grand. "
He said they did not believe when they saw one of the chimpanzees starting to climb out of its enclosure and finished one foot away when they walked over to look closer.
A spokeswoman for the Belfast city council, which runs the zoo, said a chimpanzee left the enclosure for a short period of time. "The Zookeeper was present as the chimpanzee returned from a nearby wall to another group inside the enclosure," he said.