In July 2016, two chimpanzees reportedly escaped from their cage at the National Museum / Zoo in Jos. One was recaptured and returned to its cage; the other fled the zoo premises, climbed a tree in a residential area (West‑of‑Mines), and remained at large for some time.

According to reports, the escape resulted from what was said to be a rusty/weakened cage. The chimps forced their way out searching for food.

During one escape attempt, a zoo worker who tried to capture the chimp was injured. Residents panicked.

In June 2017, another instance: a chimpanzee escaped from its cage at Jos Wildlife Park. The animal later returned (or was near its enclosure), and the park staff reportedly attempted to coax it back.

More broadly, there’s a pattern of escaped wild animals (not just chimps) at the park — a lion escape in 2015 ended tragically when the lion was shot dead.