A Moth, not a hummingbird

For the past week we have had a strange little visitor to our garden. He or she has been drinking the nectar from the Obedient plants and the Plumbago in our front yard every afternoon.  My husband thought it was a different looking hummingbird but I said no, it could not be with those antennas.  Well, Len did some research and found out it is a White-lined Sphinx Hummingbird Moth!  
They have a three inch wing span and fly just like a hummingbird, hovering over the flowers and even flying backwards.  I know I would rather see them in my garden in this stage of their life verses their larva or caterpillar stage.