Chipmunks and Ground Squirrels
When chipmunks move into a new area do they crowd out the native
population of ground squirrels ?
The habitat requirements of chipmunks and ground squirrels in Illinois, and
I believe all of the eastern U.S., are quite different, so normally they
would not be in competition. Chipmunks live in deciduous forests and
woodlands or other areas with dense underbrush. Ground squirrels live in
grassy areas, the common 13 lined ground squirrel likes short grass and
weedy areas like lawns and roadsides; the much rarer Franklin's ground
squirrel's habitat is natural prairie.
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Update: June 2012