I think this guy was just "drying out [hatching]" so he was relatively still...but I thank the motor drive on the Canon 20D which takes three shots very fast...that way one of the shots usually is good. Butterflies are tough and they flit and hover so much.
Great phot with all the detail and very clear. How did you get so close without scaring it away. Well done. Everytime I try with a s hort lens, gone with the wind.