Another day, another bizarre optical illusion doing the rounds on social media. Yup, we've already had the weird black and white/colour group shot and the car door/beach scene and now the latest is a video of a cute bunny being petted... or, is it a bird?
Sharing the clip on Twitter Dan Quintana, a biological psychiatry researcher at the University of Oslo, wrote: "Rabbits love getting stroked on their nose."
However, users were quick to respond to the optical illusion saying that they saw a black bird, most likely a crow or raven, while others insisted that they saw a cute bunny getting its nose tickled.
The animal can be seen as a bird which is having the back of its head rubbed, while it has its beak open; or the 'beak' can be seen as a couple of white-tipped bunny ears, while the 'nose' is being stroked.
My brain hurts and I am not alone because the post has since gone viral racking up thousands of likes and hundreds of responses as people try and get to the bottom of what we're looking at here.
One person wrote: "I know this is weird but for ten seconds all I could see was a crow having its head stroked."
While a second added: "Not sure if rubbing left looking rabbit on the nose or an upward looking bird on the head (ears=beak)."
A third lover-of-cap's-lock said: "YOU KNOW WHAT. THE RABBIT LOOKS LIKE A CROW. THE EARS ARE THE BEAK."
Others refused to be drawn into the debate and simply took the opportunity to take the p***; insisting that it was 'gold' - a reference to the viral dress optical illusion - or that it was 'yanny'. Classic optical illusion banter.
Just to confirm, it's definitely a bird. Or is it? Yes. It is. I think.
As one ornithological social-media user spotted: "That is not a rabbit, it is indeed a Corvid [crow family]. Notice the nictitating membrane when it blinks. Instead of moving up and down, it sweeps across the eye horizontally and is translucent."
Yeah, I was just going to point that out myself... honest. The ol' nictitating membrane, gives it away every time. Glad we cleared that up team.