These large moths are often mistaken for hummingbirds since their rapid wing movement resemble a hummer in flight (hovering over flowers while feeding). They usually fly at dusk, during the night, and at dawn, but can also be seen flying during the day. These moths are widespread and can be found throughout the United States. Their range extends north into southern and mid western Canada and south into Central and South America. Photo by Susan Deveraux on 8/22/19 in Missoula, MT.