The showy yellow and black male Tiger Swallowtails often act rather aggressive in attempts to defend a territory of prime feeding habitat like the Hairy Puccoon pictured here. They are easily approached and photographed at these times; similarly when feeding on Liatris aspera in late summer it's easy to enjoy these striking insects at close range.
The females are mostly black and considerably more difficult to approach. They are usually seen flying along tree lines.
Photographs by Marty Lucas, the lower of the two with a Nikon CoolPix 950.