Swallowtails
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Zebra Swallowtail                                          Eurytides marcellus
Potomac River near lock 34
Washington County, Maryland
May 14, 2004
Photographer:  Richard Orr                
Eastern Tiger Swallowtail                            Papilio glaucus
East Pond, Catoctin Mountains
Frederick County, Maryland
May 20, 2006
Photographer:  Richard Orr
Spicebush Swallowtail                                 Papilio troilus
Mt. Pleasant (Howard County Conservancy)
Howard County, Maryland
August 10, 2008
Photographer:  Richard Orr
Black Swallowtail (male)                             Papilio polyxenes
Assateague Island National Seashore
Worcester County, Maryland
May 21, 2009
Photographer:  Richard Orr