Assertion: woodpecker's beak | /r/MadeOf | thinner trabeculae
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text: Adaptations in the beak do not increase its strength all that much, but because the beak also contains many microscopic rod structures and thinner trabeculae, the scientists theorize that the beak has adapted over time to be able to deform—actually change its shape—during pecking, thus absorbing the impact instead of transferring it toward the brain.