The little birds have survived for 25 million years by banging their head against a tree hunting for food.
The forces on their brain are huge and have baffled scientists while inspiring crash helmet design.
Woodpeckers do this untold thousands of times during their lives, and these birds have thrived on Earth for some 25 million years.
Researchers from Boston University have studied the brains of Downy Woodpeckers and found they have elevated levels of a protein that is associated with brain damage in humans.
But new research suggests there might be traumatic effects after all
For a person, slamming your head full force into a tree trunk could be enough to knock you silly.
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