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 a common characteristics of all the birds or only in parrot family.?
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Its not just parrots.
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