At first glance, this moth is often mistaken as a hummingbird as it hovers above the flowers gathering nectar. The hummingbird clearwing is a moth of the Sphingidae (hawkmoth) family which have a wingspan around two inches, if you can glimpse the moving clear wings as it darts from flower to flower, like this milkweed blossom.
Hummingbird Clearwing Feeding