Hummingbird hawk moth

I saw two what I believe to be Hummingbird Hawk Moths feasting on some self-seeded verbena bonariensis growing out of some gravel. It is not a good photograph but you can make one of them out. Their wings beat rapidly as they hover,too fast for a phone camera to catch a sharp image. Their proboscis looks about a centimeter long, arching into the flowers syphoning up the nectar.