Eastern chipmunk (Tamias striatus)

Size: Body: 5–6″ long; Tail: 3–4; ” Weight: About 3 ounces

Signs of their presence:
The animals themselves.

Sounds: Chipmunks use a sharp repetitive chirp to alert others of danger. When startled, they’ll often respond with a single chirp followed by a short burst of chatter (1–2 seconds)

Holes that are about 2″ in diameter. Holes usually go straight down, with no dirt mound in front.

Evidence of their feeding: Like squirrels, chipmunks leave gnawed nutshells.

Garden and landscape damage: they dig up and eat flower bulbs and seeds. The digging and tunneling also cause damage.

Occasionally, chipmunks will damage buildings, but not nearly as often as other rodents.

Common nuisance situations:

Time of year: Spring through fall.

The most serious economic damage is caused by their burrowing under porches, stairs, patios, or into foundations. May undermine the structure.

Gnaw on the tubes used to collect maple syrup.

Raid bird feeders and stashes of pet food.

DIg in flower beds and vegetable gardens, uprooting plants. Eat flower bulbs, seeds, seedlings.

Loud warning chirps in the morning may disturb some people’s sleep.

Disease risks: minimal. They are host to a variety of parasites, including fleas, lice, mites, worms, and botflies.

For more information:
http://www.nwco.net/08-AppendixBNuisanceSpecies/8-02-Chipmunk.asp