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Additonal information about the Desert Tortoise and Desert Tortoise research conducted by the USGS can be found on the Western Ecological Research Center Website.
There is also a USGS program "Sonoran Desert: Fragile Land of Extremes" (Open File Report 03-305) which shows scientists from the USGS working with other scientists to understand the native plants and animals of the Sonoran Desert, including the desert tortoise.
For information on a study to track tortoise passage through highway underpasses, visit the Federal Highway Adminstration Webpage on Tortoise Underpasses.
Desert tortoise killed on a road by a car.
Photo by William I. Boarman, USGS
Click image for full resolution JPG image (438KB)
Fencing to prevent a tortoise from entering a roadway and a culvert to enable a safe crossing.
Photo by William I. Boarman, USGS
Click image for full resolution JPG image (432KB)
Barrier fencing to protect desert tortoise habitat.
Photo by William I. Boarman, USGS
Click image for full resolution JPG image (1258KB)
Signage cautioning motorists that desert tortoises may be on the roadway.
Photo by William I. Boarman, USGS
Click image for full resolution JPG image (443KB)
Off-highway vehicle tracks into an area closed to vehicles.
Photo by William I. Boarman, USGS
Click image for full resolution JPG image (603KB)
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