[Illustration: Ground squirrel damage. Semidesert type country. Note
squirrel at mouth of burrow.]
[Illustration: E.C.W. ground squirrel control crew--Payette National
Forest, Idaho.]
[Illustration: E.C.W. crew at work on Umatilla National Forest,
Washington.]
[Illustration]
Ground squirrel burrows become waterways during a rain and are the
beginning of this type of erosion.
[Illustration]
Papago Indian Reservation, Arizona.