Other animals would get significantly injured if something that heavy relative to their weight hits them.
In: Biology
The two things that happen when something is hit is that it absorbs the kinetic energy (the bit that causes injury) and transfers kinetic energy causing it to move.
Because they are smaller and flying their inertia is very low, so they are redirected much easier. Meaning most of the energy goes into the transfer of kinetic energy rather than the absorption.
* When you go to smack your brother for stealing your last juice box, you actually move a little bit of air out of the way in front of your hand as it travels through the air.
* This tiny amount of air hits your brother before your hand does but it doesn’t do much to him.
* When you go to hit a fly, however, that small amount of air is enough to push the fly away.
* Since the air also have lots of directions it can travel, it push the fly with much less force than your hand would.
* So the fly doesn’t experience nearly as much force as your brother’s face does.
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