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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K5213-3

Small waterfalls called headcuts gouge stream channels ever deeper as they move upstream. The variety and vigor of the insects that biologist Sam Testa collects will reflect the level of environmental harshness or pollution in this stream.

Photo by Scott Bauer.



640 pixels wide: (k5213-3.jpg)




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Last Modified: 5/23/2006