Scientists have debunked a popular theory of how the woodpecker can repeatedly hit its beak against a tree at high speed without doing itself brain damage.
The researchers analysed high-speed videos of three species of woodpeckers – the pileated woodpecker, black woodpecker and great spotted woodpecker.
They found their skulls don't act like shock-absorbing helmets as previously thought, but more like stiff metal hammers.
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