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News Editors: Reproducible photos for this news release can be downloaded at: http://www.werc.usgs.gov/news/2002-04-24d.jpg (Adult saguaro cacti growing in moderately dense buffelgrass infestation, Javelina Picnic Ground, Saguaro National Park, Pima Co., Ariz., Oct. 1998. Photo by Todd Esque, USGS.)