A female monkey becoming pregnant in her own cage at a Japanese zoo left staff scratching their heads for two years but finally the mystery male has been discovered.
Momo, a white-handed gibbon at Kujukushima Zoo and Botanical Garden, Nagasaki, gave birth in February 2021.
But with no males in her cage it sparked an investigation by zookeepers which involved examining excrement but as the new mum was extremely protective of her offspring, it took two years to gather samples for a DNA test.
