Why are flies so hard to swat? – Livescience.com

A fly buzzes past your head and lands nearby; you snatch a flyswatter or roll up a magazine and approach cautiously and you strike! 
But no matter how quick you are, the fly is almost always faster, and it usually manages to evade your wallop and escape unharmed. (Is it trying to annoy you?!)
Flies have many adaptations that lend them heightened speed, maneuverability and perception, making them very, very good at detecting and evading even the swiftest swats. And new evidence shows that flies’…

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