These creatures are so fascinating! My husband bought me a rue plant last spring. I wasn’t sure what to do with it so I started doing some research. I found out that it attracts black swallowtail butterflies and sure enough, by late June the plant was covered in little black caterpillars. They ate through almost the entire plant and then disappeared. Later, I was treated to quite a few butterfly sightings. The butterflies are absolutely breathtaking, too bad I couldn’t get a picture of one. I did, however, get a great video of a hungry caterpillar chomping away on the rue.