Male Japanese yellow swallowtail butterflies have light - sensitive cells on their genitalia. (discovermagazine.com)
Black - and - yellow Asian swallowtail butterfly caterpillars (Papilio xuthus), for example, are black and white with spines and look similar to bird droppings. (newscientist.com)
Tatar studied swallowtail butterflies and their larvae in a riparian forest along the Sacramento River. (sciencemag.org)