Hummingbird Clearwing moth - their wings move as rapidly as a hummingbird, and their bodies flex the same way too. When they extend their probiscus to sip nectar, it looks like a beak. The only thing that gives them away is their legs.
I keep seeing hummingbird moths in our yard. First I think they are baby hummingbirds. Then I think they are some mutant form of wasp.
Hummingbird Moths: Hummingbird moths are good hummingbird mimics. these are hummingbird imposters and fascinating.