Why don’t woodpeckers get a headache?

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It’s a triumph of adaptation involving muscles, bones, physics and brains. Firstly, they’re a sure shot – the angle of impact is all important, and woodpeckers always deliver a blow ‘straight on’, greatly reducing the stress caused. Woodpecker’s bills (beaks) are ‘reinforced’ and particularly strongly built, with a thick, horn-like covering, and a specially adapted hinge to the skull, further reducing the effects of impact.  More...