ID help please

[tanghb]

Saw this butterfly this morning at Woodcutter's Trail but could not ID it. Please help.
http://img.photobucket.com/albums/v18/tanghb/2005_sg_Nature/20050320_1101a_Woodcutters_trail_Edit1_filtered.jp g

[Birdwing]

Looks like Purple Duke to me.

[tanghb]

Thanks Steven and Rustic.

Hope I'll see a Purple Duke with open wings next time.