Where are the answers that address the twitchy movements? All the top answers are about bird eyes, which doesn’t explain the twitchy quality of the movement. Sure, they need to move their heads around a lot to see, doesn’t mean they couldn’t theoretically move their heads in a smooth way.
Now, I’ve heard it’s because bird muscles have more “white meat” and that type of muscle is for fast bursts of movement. Whereas us mammals have more red meat, which is a type of muscle that does more continuous movement. But you know, I’m not an expert on this, so…
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