TIL: birds exhibit very jerky movements mainly for depth perception — quickly switching which eye is looking at something enables comparison between viewpoints, much like humans constantly compare views from their two eyes which the brain uses to create a 3D picture.

Read more: https://birdingoutdoors.com/birds-jerky-movements-why-how-explained-examples/

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  1. Also, birds are much smaller and lighter than humans, so for them, it is much easier to make swift, discrete movements. For humans, it takes much more effort to do so, and smooth, gradually accelerating/decelerating movements are more favorable.

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