Takala, the golden-bellied mangabey, was back in the San Diego Zoo's Monkey Trains and Forest Tales exhibit Sunday after escaping for about an hour.
The young male monkey apparently got out through a hole in some overhead netting and was spotted in a ficus tree about 5:45 p.m. Saturday, The San Diego Union-Tribune reported.
"When we build a natural habitat, animals behave naturally. They sometimes surprise us and do things we don't expect them to do," Christina Simmons of the zoo told the newspaper.
Takala eventually climbed down, and zookeepers found him at one of the doors to the exhibit, Simmons said. When zookeepers opened the door, the monkey went inside.
The exhibit will be closed Sunday so zookeepers can repair the netting.