You know what bugs me? The flys (moscas) and mosquitos in México are much more evolved than in the U.S. Unless they are very large (i.e. in their Golden Years), they are very hard to kill. I sometimes think they actually hide when I have had enough and grab a fly swatter. And the mosquitoes... they're small and fast. You don't even feel the bite. It's only after they have had their meal and departed that the welt and itch show up on your ankle. Thank goodness for mosquito strips. Don't go to bed without 'em.