Audrey is trying to make "moose ears". It was a challenge for her the whole trip. These are actually some of her better ones, usually she would just put her pointer fingers on her head and yell, "moose ears!" Unfortunately with all the "moose ears" hype we didn't actually see a moose, although a few other people in the family did.
If you're interested my brother posted more, and even better, photos from the trip. You can see them here. While you're there take a minute and look around, he has some amazing photographs.