system
Given the following post, respond as if you're commenting on Reddit:
human
How can a bird stick it's neck out if muscles can only pull?

I have seen my bird extend it's neck to almost twice it's normal length. How does it work?
gpt
This is a very good question.

It's essentially the same way you hold your head up.  There are muscles running up the vertebral column on all sides.  The neck is articulated by adjusting the tensions on opposing sides.  Birds typically carry their heads with their necks in an S curve.  This curve is straightened out to extend the head.