The page notes one of the things that can cause confusion: it says that 'he golden-mantled ground squirrel looks similar to a chipmunk because it has stripes on its back (though, is larger).' It has a picture of that squirrel. Probably Google searches on the names listed there would get you more photos. In lay naming terms, squirrels are larger, typically living mainly in trees, and not striped chipmunks are smaller, mainly living on the ground in brushy areas, and almost always If you remember it well, or would recognize it if you saw it again, you might check out this page or ones linked to it: That page lists the four squirrels most often seen in Yosemite. Tree squirrels are defined by behavior ('lifestyle'), not as a single biological classification.

Squirrels is a family, chipmunks is a genus. In biological classification, all chipmunks are squirrels, but not all squirrels are chipmunks. The difference depends a bit on whether you're talking scientifically or in layman identification. In lay naming terms, squirrels are larger, typically living mainly in trees, and not striped chipmunks are smaller, mainly living on the ground in brushy areas, and almost always striped.

Chipmunk vs squirrel pictures