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![Download a high-resolution (300dpi) digital image](https://webarchive.library.unt.edu/eot2008/20081103191548im_/http://www.ars.usda.gov/is/graphics/photos/downloadbutton.gif)
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: 05/23/2006
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