We call them Hummingbird Moths because of how they fly and maneuver like a Hummingbird. They can quickly change flight direction flying left, right, up and down, and hover in front of a blossom. With their wings a blur and their rapid movements from one blossom to another, it's a wonder these moths are such a challenge to photograph. In this image we can see the wings as they appear almost motionless because of the use of a camera flash. Without the use of a flash, the wings would be difficult to freeze in position and they would be blurred. This particular moth is a Hummingbird Clear Wing and as you can see in the photo, there are clear windows in their wings which they are named after.
While most sphinx moths fly at night, hummingbird moths fly during the day. They can be found in a wide variety of habitats, including open meadows, forest edges, and suburban gardens. They feed on flower nectar, dipping in a long thin proboscis.
Hummingbird moths lay their eggs on plants. The mature caterpillars are plump, and yellowish green (or sometimes brownish), with the spiky tail horn typical of most sphinx moth caterpillars.