system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do woodpeckers brains not receive trauma from beating their face on trees all day?
gpt
I can answer this!

They have a number of really cool features. It starts with a beak made of three layers of bone and spongey material that absorbs a lot of the impact. Then their brains are pretty smooth and fit tightly within their skull so there's not space to rattle it around. The skull is made of a really cool spongey bone that also absorbs a lot of the energy.

It turns out though that most of the energy is spread all over the body, so not that much is being absorbed by the skull. Also, cool fact: their beaks heat up, so that's why they drill in short bursts!