Butterflies while cutting firewood

[Paul Cherubini]

Cris Guppy & Aud Fischer wrote:

> I also found 4 Mourning Cloak
> (Nymphalis antiopa) pupae, apparently alive and hibernating for the
> winter. I left them in place for the winter, and anticipate that in
> the spring parasites will emerge.  

Does anybody on the list know whether or not the Mourning Cloak butterfly regularly 
passes the winter in the pupa stage in northern climates? Or is only the adult butterfly 
capable of surviving the winter cold?

Paul Cherubini, Placerville, California