Wasps are worse than squirrels...
I ran a basic D&D campaign once where the number of PC deaths from giant bees out weighed the deaths by dragons, and the deaths by giant insects and arachnids out weighed the deaths by everything else combined.
I am currently playing a Gnome wizard/prestige class of my own design. I thought about going Illusionist, but I didnt want to give up the spells, or the magic items that require those spells to create. He is a tinker after all, and one feat away from having every item creation feat.