Some shots of the Giant Swallowtail Butterfly the girls found in caterpillar form a week and a half ago and named spot. They are affectionately called Poop turd caterpillars, as they resemble bird droppings. Giant Swallowtail Butterfly: Egg, Caterpillar, Chrysalis and Butterfly, nectar and host plants In it's natural habitat. In our habitat. Still alive a week and a half later and eaten seven leaves.