Just found a few more butterflies for Jennifer in my archives. I photographed these this past summer at Green Spring Gardens in Virginia.
I’m fairly certain these are Eastern Tiger Swallowtails.
See: http://www.nearctica.com/butter/plate1/Pglauc.htm
or http://www.chesapeakebay.net/swallowtail.htm.
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your photos are so beautiful! the lighting on this butterfly really warms up the picture and really makes the yellow stand out!