Nuala Zietsma had just arrived at the Toronto Zoo with her 2-year-old son when she found herself catching a somewhat daring escape on camera.

Zietsma sent the Stara video of two long-tailed lemurs traipsing around the African Rainforest Pavilion around 10 a.m. Wednesday, after they found a way out of their pen.

“There were probably at least four or five of them in there,” she said. “Two of them were walking around the fence, and the other two were coming down the fence.”

The video clearly shows two lemurs keeping their distance from human onlookers.

“I called the zoo’s emergency line and the zookeeper arrived, looking a little shocked,” she said. “They immediately evacuated the building. … Just as we were coming out, I saw that a whole class of students was about to go in.”

Zoo spokesperson Lesley Dean said the zoo had installed an “introductory enclosure” within the lemur exhibit a few weeks ago to do a “nice and slow introduction” of the new female that has been added to the troop.

Dean said Wednesday’s escape happened because the lemurs were able to get to the top of the enclosure and jump over the plexiglass barrier.

“The staff were able to easily get them back into their exhibit and removed the introductory enclosure to prevent this from happening again,” said Dean. “There was no threat to the public, as lemurs are not an aggressive species. Some zoos actually have walk-through lemur exhibits.”

While surprised at first, Zietsma said the experience was exciting, especially for her son.

“I’m sure he would have loved to have played with them,” she said. “But it’s a wild animal. You just never know.”