These showy butterflies can be found from British Columbia south to Baja California and inland to Montana and Nevada. Like many butterfly species, there’s an incredible visual difference between the bottom (ventral) side of the wings and the top (dorsal) side of the wings. They frequent river bottomlands, lakeshores, and forest edges where the larvae feed on willows, poplars, and chokecherry. 

Photo by: Glenn Marangelo on 7/3/21 in the National Bison Range near Moiese, MT