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Orange, Red Thermophile Bacteria At Yellowstone. This Closeup Image Of Red And Orange Heat-Loving Bacteria Coating The Bottom Of A Runoff Stream From A Boiling Hotspring Is Vivid And Stunning. Great For Background And Texture. On An Applied Basis, These Bacteria Are Used By Pharmaceutical Companies To Develop New Drugs And Treatments. These Colorful Hotsprings And Runoff Streams Are Also A Large Attraction For Tourists Who Visit Yellowstone National Park.