It's pretty incredible that they don't hurt themselves. They exert A LOT of force everytime their beaks strike. But yes, they have evolved in such a way that repeatedly bashing their faces into trees over and over again, all day every day, doesn't actually hurt them at all. I didn't know that they don't have vocal cords, though. I thought they made bird-like chirping noises like all the rest of the birds. Do you have a source on the "no vocal cords" bit?
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Here is the source.
Thanks gogo for the opportunity...