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| Banding Summer Tanager. Photo by Dan Twedt, USGS. |
Tree plot. Photo by Dan Twedt, USGS. |
Researchers studying abundance of food for wintering waterfowl typically collect soil cores from wetlands and then separate food items from the soil. This method has been used effectively in the Lower Mississippi Valley to study abundance of natural and agricultural seeds, and tubers of wetland plants. Photo by Ken Reinecke, USGS. |
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| By feeding known amounts of selected foods to captive mallards and analyzing the resulting feces, researchers have provided managers with a good understanding of the nutrients and energy available in the most important winter foods of waterfowl. Photo by Ken Reinecke, USGS. |
Weighing a mallard duck with a holding bag and hanging balance. Body weight is a primary measure of the health of animals being used in experiments. 2002. Pete Albers. Photo by Ilana Schafer, U. of MD. Photo by Pete Albers, USGS. |
Tying a 2-gram radio transmitter to a sora rail during field studies in the wild rice marshes of the Patuxent River. Photo by Mike Haramis, USGS. |
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| Diamondback Terrapins await processing during winter sampling on Chesapeake Bay. Photo by Mike Haramis, USGS. |
Captured from cold bay water, Diamondback Terrapins remain dormant on boat deck before processing and release. Photo by Mike Haramis, USGS. |
Biologist remove Diamondback Terrapin from fyke net during summer field study on Chesapeake Bay. Photo by Mike Haramis, USGS. |
