. Figure 4. Habitat modification due to hog raising on a sand ridge in Scott County, Illinois. Note that the hog pen is de- nuded of vegetation. The dead trees in the area adjacent to the pen were probably killed earlier by hogs. The fertile, level land (with more clay, silt, and/or organic matter) in the foreground is planted in corn. Illinois chorus frogs {Pseudacru streckeri illinoensis) were heard calling in the springs of 1984 and 1985 not far from this site. Photograph taken on 30 August 1985 by Kevin J. Tarrant.

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Keywords: ., bookauthorillinoisnaturalhist, bookcentury1900, booksubjectfrogs