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I have been wondering why would insects in general, not be scared when important changes happen on your monitor where they have landed...

If you move even just a finger, they are scared to death and fly away, but anything on my monitor and they remain completely placid.

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Ha ha interesting question. Maybe 0.5 second of no change in graphics on your monitor is enough for a fly/mosquito/other to infer that the thing is not moving. And once they landed they may not see what under their feet and can't detect further movement. Or they might just understand that the thing they're walking on is not moving and therefore whatever they see, they grasp there is no danger. Also are you sure that the insects that land on your monitor are those that are really scared of movement such as mosquitoes for example. –  Remi.b May 25 at 8:00
Today it was a large fly. I've mainly got flies, but saw some other insects there too. Note that I, on purpose, would say... move a window under the insect and saw absolutely no reaction. So I can say that there was rather heavy movement. –  Alexis Wilke May 25 at 10:05

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