Pipevine Swallowtail (Battus philenor)
Origin: North and Central America
Sighted at: Hamilton Pool Nature Preserve, Austin, TX
Also known as the Blue Swallowtail, this species of butterfly is confusingly sometimes blue and sometimes not blue.
Adult pipevine swallowtails are poisonous: consequentially, many other species of butterfly mimick the appearance of pipevines to ward away predators.