I read that, technically speaking, the bumblebee and moth should not be able to fly. Aerodynamically, their bodies should not be able to stay afloat, let alone move thru the skies.
How a bumblebee flies:
http://wiki.answers.com/Q/How_does_a_bumble_bee_fly
How a moth flies:
http://www.ehow.com/how-does_4743029_a-moth-fly.html
Google is your friend.
The Wolf