swallowtail larvae id

[Linda & Jeff Ives]

Hi,
My daughter and I found some caterpillars on Queen Ann's lace today.  I'm not sure what kind of larvae they are.  I don't want to send a photo to the whole list.  Would anyone be willing to help me id it if I sent them a photo?
I also wonder if I can bring it into school for my students to see, or if I should put it back outside since it may be the over-wintering generation.  Any ideas?
Thanks much,
Linda in Marlborough 
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