The eastern chipmunk is a small, agile rodent found throughout Pennsylvania. Colloquial names include grinny, chippie, hackle and rock squirrel. The species ranges from Quebec south to northern Florida and Louisiana, and from the eastern seaboard west to Oklahoma, Kansas, the Dakotas and Saskatchewan.
Sexes are the same size.
A chipmunk's head is blunt with rounded, erect ears. The legs are short. Each hind foot has five clawed toes, and each forefoot has four clawed toes and a fifth, thumb-like, digit with a soft, rounded nail. The tail is well-furred and flattened. The front incisor teeth are broad and chisel-shaped like those of other rodents.