Chipmunk because of the strips on its back. Chipmunks also have strips on their faces, which is one way to tell them apart. Chipmunks are also diminutive compared to the rotund Golden-mantled ground squirrel.
Lake Haiyaha. I viewed its joyful frolicking in the dirt as a celebration of life and of summer. These squirrels hibernate most of the winter and summer is their time to eat, play, and reproduce. I would be frolicking in the dirt too!
Fox Squirrel. Collecting snacks for the winter, they store food in their infinitely expanding cheek pouches. Puffed up and oh so cute I think this evolutionary strategy has changed to lure foolish hikers into giving up their lunches. Don't be fooled! Insects are a much better diet than tortilla chips for this squirrel, and probably for yourself as well.