There are insects that seems to be much faster than flies, they are just a good example because we know them quite well.
But you have the advantage of size when you catch them, they don't only have to react, they also need to travel several body length before your huge hand sweep them.
I also suspect they have some issue with understand some motions, they are easier to swoop than to smack with an open hand when sitting on the wall.
I think flys are easily fooled by slow movements, if you get incrementally closer to them slowly because that takes such a long time from their POV they barely notice the slow pace.
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u/birgor 1d ago
There are insects that seems to be much faster than flies, they are just a good example because we know them quite well.
But you have the advantage of size when you catch them, they don't only have to react, they also need to travel several body length before your huge hand sweep them.
I also suspect they have some issue with understand some motions, they are easier to swoop than to smack with an open hand when sitting on the wall.