Perhaps some (or a lot!) of your Facebook Friends have changed their profile pictures to a giraffe. Maybe you have too? Welcome to 'The Great Giraffe Challenge'.

How did it start? We've traced it back to New Zealander Andrew Strugnell who apparently started The Great Giraffe Challenge.

See if you can figure it out, before I give you the answer!

 

Think you know the answer?
Keep reading to see if you're right. Remember, you're bound by the honor system to change your profile picture to a giraffe if you get it wrong!