In February 2021, a gibbon by the name of Momo gave birth, despite living alone in her enclosure in a Japanese zoo. Two years later, the mystery of her seemingly miraculous pregnancy has been solved. It seems her enclosure wasn’t quite as isolated as zookeepers thought.

According to Wikipedia, multiple health agencies suggested sex along these lines during the height of the COVID-19 pandemic. Good on these gibbons for listening to guidelines and practicing healthy sex.