We know that Noach took onto the ark all kinds of animals including "every creeping thing of the ground" (מִכֹּל רֶמֶשׂ הָאֲדָמָה), which I've always understood to be creeping things that actually locomote on the ground, not all bugs. Does this last group include insects like flies, mosquitos, cicadas, bees, and so forth, bugs that fly or fritter about or buzz but don't creep? If not, how did they survive?
(I grant that this question assumes they were created during the six days though they aren't mentioned there either, so one possibility is that they're considered too insignificant to be mentioned. If so, I'd appreciate a source for that.)