DALLAS (CBSDFW.COM) For the second time in less than two weeks, an animal managed to get out inside of the Dallas Zoo’s primate habitat.

Freedom for the older, female, spider monkey was short-lived, about 20 minutes, after someone didn’t properly secure an enclosure door.

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“It looked like a lock that was left unlocked and a door, a keeper door, that this spider monkey decided to try and go out and see. [It] never left the area, was right there with his other buddies, but none the less was a human error,” explained Gregg Hudson, the executive director of the Dallas Zoo and The Children’s Aquarium at Fair Park.

The president of the Dallas Zoological Society, Michael Meadows, said the spider monkey is small and not considered dangerous. “We took it very calmly and contained her, brought her back in with nets and food and she’s now back in her enclosure.”

On October 25 a chimpanzee got out of its cage at the zoo.

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Monday’s incident is the third time an animal has escaped in or from the Wilds of Africa exhibit.

Hudson said there’s a problem that needs to be addressed.

“Not a facility problem, not a mechanical problem, not an animal problem – it’s been a human error issue,” said Hudson. “We’ve got emergency procedures in place at work, but the problems that we’ve had with employee problems, as far as human error, that’s really what we want to try and eliminate as much as possible.”

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Officials are now working with outside experts to figure out what training or changes need to be made at the zoo.