One of my all time favorite dragons. jnstuart, Bosque Bill (Bill is not on iNat) and I spent an hour or two near the Rio Grande in a flood channel overflow area partially grown up in low brush. We probably saw 6 or 8 Brimstones during that time. Three shots of males and two shots of females posted. Someone once described the female Brimstone as "a beautiful blue-eyed blonde". I have to agree.