File:Bacteria mats - Daisy geyser - Yellowstone 2004 12 d.jpg

Summary
Flies on bacteria mat by Daisy geyser, Upper Geyser Basin, Yellowstone. Taken by Matti Mero, December 2004. During cold weather the arthropods that live on the mats are confined to the small livable zone between the hot water and the frigid air.