Bird or Bunny? Optical illusion causes a frenzy on the internet

An optical illusion is driving the internet crazy.
Do you think it's a bird or a bunny?
 
Well, it's an African white-necked raven named "Mischief" to be exact. The 18-year-old raven belongs to the World Bird Sanctuary in Missouri.
Not only does the raven fly, he also talks and of course confuses the internet.