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caterpillar with spikes - Nymphalis l-album

caterpillar with spikes - Nymphalis l-album
Hiles, Forest County, Wisconsin, USA
June 10, 2012
Not sure what kind of leaf the caterpillar is eating. Habitat was interior forest (birch, maple, balsam fir)

Compton Tortoiseshell
The leaf looks like a Poplar / Aspen.

Moved from Butterflies (excluding skippers).

Moved from ID Request.

Polygonia interrogationis - Question Mark?

In looking at all the picture
In looking at all the pictures they are variable. The leaf that it was on could be an elm. Sounds likely.

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