Can you find the leopard lurking in this photograph?
That seemingly simple task had hordes of squinting social media users scratching their heads overnight, with the camouflaged big cat proving hard to spot.
Twitter user Bella Lack shared the image, saying she was sent it by a friend and became convinced it was a joke until she eventually discovered the leopard.
The predator's spots make it blend almost entirely into its rocky surrounds, with many unable to find it without some help.