I finally saw my first Giant Swallowtail of 2016 on July 26th, just north of Norwood. Good to see others have been seeing them as well. I was beginning to think that they were vanishing about as suddenly as they first appeared in the Kawarthas, back in 2011 or thereabouts.
Note: I had a Giant Swallowtail in my garden in Peterborough on August 4 and one at the Riverside Zoo. D.M.