How do you know it's a Canadian swallowtail caterpillar instead of an eastern tiger swallowtail? Were you in Canada or the northern tier of the U.S. when you found it and brought it home?

Sherry

If it is a "He" (already raised to adulthood) there would not be any eggs that would hatch into caterpillars.

Or has your found butterfly (she) already laid eggs?

It sounds to me as if they found a caterpillar that they intend to raise and they are simply using "him" as a generic term. Hopefully they'll check back and clarify.

Martha