don't know if I have seen mosquitoes where I live, don't know if we even have them, I have definitely never seen a cockroach, where I live. so these two have thankfully never had the opportunity to bother me.
As for spiders I have never seen one over 2 inches, though there was one my dog nearly eat, last night that was pretty big, I managed to stop him from eating it. I think I heard many of the British spiders were poisoness only there jaws are not strong enough to pierce are skin, so that = harmless. they generally don't come out unless the room is dimly lit and they stay well clear of you if they do.
so that means by default fly's are the most annoying of the four to me.
correct me if I am wrong
stop me if I am bias
I love a good civilised debate (but only if we can learn something).
