The pic was posted on Facebook on 9th July 2016, and BBC Earth fans have been fighting with their neurons to solve the brainteaser ever since. This puzzle is even more frenzied because it is so hard to trace figures in B&W pics. However, BBC did leave us a clue.
The picture depicts zeal of Zebras drawn closely to each other. The illusion drawing was created by Pierangelo Pirak (@ppirak) and was later shared on BBC Earth Facebook Page. The clue was included in the caption of the picture which went like this: ‘It’s been driving some people crazy. Can you spot the badger?’