Those are definitely bold little birds, but one of my favourites. They'll eat the lunch out of your hands if you let them. There are a few suggestions on the origin of the name - one is that Whiskeyjack comes from following those who used to bring liquor into the logging camps (in old naval terms, every sailor was called a 'Jack'). Another is that the bird was named after the Cree 'trickster' spirit, Wisakedjak (Wiisagejaak in the Saulteaux language), which given its habits, may be more apt! You could call them 'Gray Jays' or Perisoreus canadensis if you want to get picky.
Enough language lessons for the day... really like the image, though.