Cat or crow?

This simple picture of someone's bet has become the subject of a massive internet debate after it went viral.

Twitter user Robert Maguire first shared the image on Twitter, and at first glance it looks like the side profile of a crow.

He captioned the snap: "This picture of a crow is interesting because … it's actually a cat."

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The image has received over 163,000 reactions and has been shared almost 60,000 times.

"My mind has been blown," wrote one user.

"I had to do a double take," wrote another.