Female Eastern swallowtails tend to have more blue on the hindwings than the males. A dark form looks similar to a pipevine swallowtail. Thin yellow and black body Black and yellow tiger stripes ...

Some female eastern tiger swallowtails may use this defense. They can either be yellow, like the males of their species, or dark to mimic the bitter pipevine swallowtail. The dark form is found ...