What is major difference between squirrel vs chipmunk?

Nature Talk
6

Facial striping probably isn’t unique to chipmunks but it’s a helpful characteristic to look for in a photo when trying to distinguish chipmunks from other ground squirrels in the area such as Callospermophilus or Ammospermophilus (in western US). Telling the species of chipmunks apart in western NorthAm is the real challenge.