Can you capture one in a glass jar and take it to Dr. King at the Queenston Bridge? He's with CFIA and would be able to determine what it is or, find someone that could determine the species and if it's harmful to our enviroment.
While we don't want to see it intrude or harm our pets, it would be ideal to determine whether or not it would be damaging to our plants, trees and natural surroundings.
Just a thought...