Spiky caterpillar - Polygonia interrogationis
Columbia County, Pennsylvania, USA
Size: 2 1/2 in.
What is this spiky caterpillar? ID help wanted. It was crawling up a birch tree (I think.)
UPDATE: One pupated!
UPDATE: Two more pupated!
UPDATE: One eclosed!
UPDATE: All pupated!
Update: All eclosed.
UPDATE: I now have eight chrysalises.
UPDATE: One eclosed-it was a Question mark!
Images of this individual: tag all