Top Photo: Polygonia interrogationis on Ulmus. The caterpillars in these photos are question marks (Polygonia interrogationis). They’re butterfly caterpillars. Looking at the photos you may think they’re named for the shape they sometimes assume when disturbed. Not so. They are, in fact, named after the punctuation mark (?) but not because of the way the caterpillars scrunch up when hassled. No, question marks are named for markings on the underside of the adult butterfly’s hindwings which are roughly the shapeRead more