Chipmunks are as cute as can be, with their enchanting eyes, bushy tails, striped backs, and chubby cheeks. You may have seen these tiny rodents darting around your yard or nearby woodlands. Or you may know them from Hollywood. Walt Disney introduced his animated chipmunk duo, Chip and Dale, in 1943, and 15 years later, singer Ross Bagdasarian captured America’s heart with three chipmunk brothers—Alvin, Simon, Theodore—singing their musical hit “The Chipmunk Song (Christmas Don’t Be Late).”

Nevertheless, these pudgy-faced charmers are so much more than that. The following chipmunk trivia—touching on everything from their complex personalities and food habits to their social proclivities and living preferences—may just surprise you. Tiny doesn’t always mean simple.

  1. They Need About 15 Hours of Sleep Per Day
    At least that’s true of chipmunks in captivity. If their wild cousins require the same amount of snooze time, then all that zippy scampering you see outside has to get done during a nine-hour window each day.
  2. They Are a Type of Squirrel
    Weighing in at 1 to 5 ounces (28 to 142 grams), chipmunks are among the most diminutive members of the squirrel family. That means these pocket-sized rodents are also related to woodchucks and prairie dogs, which sharing a branch on the squirrel family tree as well.
  3. Most Chipmunks Are in North America
    There are 25 species of chipmunks, ranging mostly from Canada to Mexico across a variety of stomping grounds from forests to deserts to suburban neighborhoods. Only one species, the Siberian chipmunk, makes its home outside North America, scampering over much of northern Asia as well as in Europe, where it was introduced via the pet trade in the 1960s.
  4. They Prefer Subterranean Living
    While some chipmunks make nests in logs or bushes, most prefer to dig vast underground burrows. These hidden homes typically include a camouflaged entrance hole, tunnel systems that can stretch 10 to 30 feet (3 to 9 meters) long, food storage areas, and a nesting chamber that is kept immaculately clean and lined with leaves and other plant matter.