Any creature in a meadow of bright yellow flowers is adorable, but these cute and furry ground squirrels are also very entertaining. You may also know them as marmots, groundhogs, woodchucks or whistle pigs. The last name describes the shrill call they make to alert the colony of trespassers nearby (such as us humans). Which also means that as you walk through whistle pig territory (Yellowstone National Park), you have high-pitched music following you around everywhere you go.