The reason why woodpeckers are pecking continuously into the trunk is 17 times / second but there is no headache

Woodpeckers can knock 17 times per second into a tree with a force of 12,000 times their gravity but their brains and retinas are not injured.

1. The flying owl catches the "lightning" prey of the world's fastest flying bird
2. Decipher the mystery of pig birds, birds signal death
3. The ultimate snake surgery of the tall bird is called the "Taekwondo killer".

If a person is hit hard in the head, the deep blood vessels in the eye can be broken, the nerves in this area are also damaged. But woodpeckers knocked on the trunk about 12,000 and every day was unharmed. What's special about their skull structure, watch the video below for answers.

See also: Poisonous birds, which can kill people just by touching their feathers