This is Hemaris thysbe, the hummngbird clearwing moth. Famliy Spingidae or sphinx moth family. Many are day feeders and are attracted to flowers while others feed at dusk and at night.. Their cocoons are found in soil of loose leaf litter. The name sphinx comes for the fact that the catapillers rear ther heads up and mimic the pose of the mythical sphinx. They also often have a long slender horn on the back thus the name "hornworm" is applied to the catapillers and moths of this family.
These moths are fast flyers and have fascinating wing patterns.
Our moth here has clear wing patches on both upper and lower wings.
These guys always make me smile when they stop by to feed at the beebalm. They also like milkweed and you can find many of them in big patchs of milkweed.
Next time you think you are seeing a hummingbird, look closer, it could be this little mimic moth.