IMG 2011-Jul11 at Winnipeg:  Black swallowtail butterfly=Parselyworm (Papilio polyxenes) caterpillar found on Canada thistle (Cirsium arvense)
2011-Jul11 at Winnipeg:  Black swallowtail butterfly=Parselyworm (Papilio polyxenes) caterpillar found on Canada thistle (Cirsium arvense)