A simple picture of a pet owner's cat has become the subject of a vigorous debate after it went viral on social media overnight.
At first glance, the image shared by Twitter user Robert Maguire, appears to show the side profile of a crow on a tiled floor.
However, as the uploader pointed out this isn't the case. Captioning the image he wrote: "This picture of a crow is interesting because … it's actually a cat."
On closer inspection, you can clearly see the image shows a black cat looking up at the camera with its head tilted so its ear looks like a bird's beak.
Mr Maguire's picture has now prompted more than 123,000 reactions and more than 42,000 shares by baffled Twitter netizens.
"My mind has been blown," wrote one user.
"I had to do a double take," wrote another.
Others pointed out similarities to another famous optical illusion, the duck or the hare, which can say a lot about your brain depending on what you see.