A video posted on Twitter on Sunday has some people thinking they see a bunny and others thinking they see a bird.
The optical illusion video, posted by University of Oslo researcher Daniel S. Quintana, shows someone petting an animal. Some see a bird, whose beak is pointing up, and others see a bunny with white on the tips of its ears.
CNN reported that those who think they see a bird are correct. The original video appears to have been uploaded to Instagram in May 2017 by Paige Davis, a curator of bird training at World Bird Sanctuary in Valley Park, Missouri.
"Rabbits love getting stroked on their nose," Quintana tweeted with the video.
Quintana said he shared the video based on the old rabbit/duck illusion.
"The static bird/rabbit illusion is well-known within psychology and philosophy, so when I saw a video, I thought it would be interesting to share it, " Quintana told CNet in an email.
"I thought it was fairly clear that the video was of a bird... as you can see the translucent nictitating membrane sweep across the eye horizontally (rabbits don't have membranes like this) and the positioning of the 'ears' are a little strange," he said.
Davis became aware of the viral tweet, and said that the bird is a raven named Mischief.
"Mischief is quite the talk on Twitter today! (Video in my story)," she posted Wednesday. "I can assure you that he is in fact a raven. And a talented raven at that!"
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