Why This Image of a Woodpecker Is Creeping People Out

When a seemingly innocuous image of a woodpecker stashing away its acorn supply made the internet rounds, Twitter-users expressed revulsion. They weren’t reacting to the bird or the actual acorns, but to the set of holes in which the bird was storing its treasure. Clustered in an irregular pattern, the holes were triggering a condition called trypophobia.

To someone with this phobia, an otherwise benign – and even downright gorgeous – image can spark fear and disgust. These individuals aren’t just afraid of any hole they see. Trypophobia is characterized by an aversion to clustered patterns of irregular holes or bumps. The term seems to have been coined by someone in an online forum in 2005, though scientists say the condition has likely been around for much longer.

“We know that this condition pre-existed the internet — although the internet may have exacerbated it,” Arnold Wilkins, a psychologist at the University of Essex, told Live Science. 

The phobia isn’t an official disorder, meaning it’s not listed in the “Diagnostic and Statistical Manual of Mental Disorders,” but up to 10% of people report experiencing symptoms, which include anxiety, nausea and a “skin-crawling” sensation, Wilkins said, after viewing certain images. “It can be quite debilitating,” he added.

So why is this phobia so common? Scientists are still trying to answer this question, but many believe the aversion is evolutionarily adaptive.

“You avoid things that are likely to harm you,” Wilkins explained.

In the first ever scientific documentation of trypophobia published in Psychological Science, Wilkins compared trypophobia-triggering images with pictures of poisonous animals, like the blue-ringed octopus. He and his co-authors found a similar distribution of spots, bumps or holes, as well as a similar level of contrast in the images. The researchers concluded that the phobia could stem from an evolutionarily adaptive aversion to poisonous creatures.

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