[theVirginian]

It would appear they haven't yet evolved to deal with being hit by cars quite as gracefully.

[whoopdedo]

I think this can be approached the same as the "ants can lift 50 times their own weight" bit of trivia. It doesn't translate to "if a human were as strong as an ant he'd be able to lift an elephant" because size doesn't scale that way. Ants and mosquitoes get away with larger forces relative to their mass because the skeleton and muscles needed are still within reasonable material and fuel costs. A human-sized animal that wanted to survive being hit by a car would need to spend much more energy per mass than the insect does.

[eru]

I think theVirginian was commenting about mosquitoes getting smashed on a car's windshield, not about cars and humans.