Thanks to a tip from a fellow PBaser, I finally saw some giant swallowtails and got a few photos. Only this one stayed around to nectar but it fluttered its wings constantly creating a blur, and would not remain still, so it was a challenge to get even this shot. But anyway, I was happy just to watch it for 10-15 minutes, as it moved from one red clover flower to another alongside the trail, ignoring all other flowering plants.