Question Mark (Polygonia interrogationis)

Note the white markings in the middle of the underhindwing for which the insect is named. This individual is enjoying Will Cook's arm!

This individual is imbibing nutrients from River Otter scat.

Despite lacking the "dot" and hence looking vaguely like a comma, note the orientation of the comma-shaped mark in the middle of the underhindwing. Connecting the ends of this "comma" with an imaginary straight line extending beyond the wing edges yields a line roughly parallel with the outer edge of the wing, indicating this is a Question Mark. Such an imaginary line never approaches the butterfly's head. On the other hand, connecting the ends of the mark on a true comma species (e.g. Eastern Comma) yields a line roughly perpendicular to the outer edge and which would connect the wing outer edge to the butterfly's head. In other words, the axis of the comma portion of the punctuation mark on a Question Mark is vertical, whereas the axis of the analagous mark on an Eastern Comma (and all other comma species) is horizontal.

Photos highly cropped from originals

Question Marks, like all anglewings, are fond of feeding on oozing sap from injured trees.

Note that this individual was perching but not nectaring on these flowers.