
[T]he black swallowtail [engages] in a lek mating system. These butterflies satisfy the four criteria for lekking behavior... (1) there is no male parental care, (2) males aggregate at specific sites for display, (3) the only resource females find at the lek are the males themselves and (4) females can select their mates.
There were no males around yesterday at 4:26 pm when I caught this lady lolling on a redbud leaf just outside our door.
IN THE COMMENTS: Fritz says, "Alas, this is not an actual Black Swallowtail. It's a swallowtail, and it's black, but it is the black morph of the Tiger Swallowtail...."