: How do birds keep their heads in a fixed position, just like a Gyro/Gimbal? So I have a friend of mine with a redneck parrot. I noticed even if I move the bird in any direction his head remains in a fixed position. Is this

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Its not just parrots.

Or Chickens

And pigeons bob their heads for the same reasons - unlike humans, who adjust their eyes to stabilise their vision, birds shift their heads - or as the paper I'm looking at says

This has led to the view that the
pigeon’s head-bobbing is an optokinetic response to
stabilize the retinal image during the hold phase

Here's a pretty good article on the topic that I vaguely referenced