A mind-boggling video reminiscent of a famous optical illusion has sparked a furious debate online — is it a raven or a rabbit?
Dan Quintana, a biological psychiatry researcher at the University of Oslo, shared a video on Twitter on Monday of him stroking an animal.
"Rabbits love getting stroked on their nose," he captioned the post.
At first, it looks like he is scratching a raven's head, but the caption caused a hilarious discussion online as the video speaks similarly to the duck or rabbit phenomenon.
