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Black flies need flowing water to develop. Black fly larvae are attached to solid surfaces, like rocks, and feed by filtering the water that flows around them.
Scotty's Castle is located near natural springs which support dense vegetation (see vegetation in the background of photo above) in this otherwise barren landscape. These springs were tapped to provide water for the home. So much water is available that some landscape features sport permanent flowing water, which supports a vibrant black fly population!
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