KANSAS CITY, Missouri - Visitors got to witness some monkey business Tuesday afternoon at the Kansas City Zoo .
Zoo patrons were kept inside a building for a short while when a monkey escaped its holding area.
Zoo spokeswoman Julie Neemeyer said the red-capped mangabey escaped from its enclosure near the Congo area in Africa , across from the swinging bridge.
Neemeyer said it was a keeper error. The padlock was not locked.
Animal health staff was able to tranquilize the monkey.
According to Neemeyer, zoo staff always moves the public away when animals escape.