The Question Mark's dark markings, irregular wing edges and cryptically colored undersides help the butterfly resemble a dead leaf when resting. Adults have a strong, rapid flight but frequently alight on overhanging branches, tree trunks or leaf litter. Wary and nervous, they are often difficult to closely approach. Males readily establish territories and aggressively investigate any passing objects. Both sexes visit rotting fruit, dung, carrion and tree sap.