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birds see images at a much higher frequency than us humans and thus detect movement much better. This is important for spotting predators (or for raptors spotting mice). E.g. most parrots can see at about 150-200 frames per second (fps), so when they watch television (about 24 fps for normal TV and 50-60 fps for HDTV), it looks like a slide show to them. Birds can also perceive very slow movements, such as the movement of the sun.
This should be taken into account with lighting of the area your parrot is in. Most regular neon tube lights have a frequency of 120Hz, which probably looks to your bird as if someone is constantly turning the light switch on and off. So in order to avoid behavioral issues you should make sure to at least use a 400Hz tube.
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